Data Science

Data science is an inter-disciplinary field that uses scientific methods, processes, algorithms, and systems to extract knowledge from structured and unstructured data. Data scientists perform data analysis and preparation, and their findings inform high-level decisions in many organizations.

GitHub: https://github.com/topics/data-science
Wikipedia: https://en.wikipedia.org/wiki/Data_science
Related Topics: data-analysis, data-mining, machine-learning, big-data, data-visualization,
Aliases: datasciences, data-science-project, data-science-algorithm,
Last updated: 2026-07-12 00:07:40 UTC
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https://github.com/woctezuma/regression

Gaussian Process Regression vs. Relevance Vector Machine.

data-analysis data-science gaussian-process-regression machine-learning python regression relevance-vector-machine statistics

Last synced: 17 Jul 2025

https://github.com/iguptashubham/metro-operations-optimization

Metro Operations Optimization refers to the systematic process of enhancing the efficiency, reliability, and effectiveness of Metro services through various data-driven techniques and operational adjustments.

data-analysis-project data-science data-science-projects

Last synced: 11 Jun 2026

https://github.com/thebutlah/makrl

makrl - modular algorithm kit for reinforcement learning

data-science deep-learning deep-reinforcement-learning halite neural-networks reinforcement-learning

Last synced: 18 Mar 2025

https://github.com/walterowisk/dio_labproject-pipeline-etl-python

Desafio de projeto proposto pela DIO dentro do Santander Bootcamp 2023 - Ciência de Dados com Python

colab-notebook data-science dio-bootcamp etl etl-pipeline google-colab python

Last synced: 12 Apr 2025

https://github.com/arv-anshul/ineuron-money-laundering

A project from Ineuron Internship portal to build a ML model to predict the Money Laundering.

data-science ineuron-ai internship machine-learning project python3

Last synced: 13 Sep 2025

https://github.com/cosmoduende/r-ufo-sightings

Are we alone in the universe? - Data Analysis and Data Visualization of UFO sightings with R. How to analyze and visualize data of UFO sightings of the last century in the USA and the rest of the world with R language.

data-analysis data-analytics data-science data-visualisation data-visualization data-visualizations dataviz ovni ovni-dataset r-code r-language r-programming r-stats ufo ufo-analysis ufo-dataset ufo-sighting ufo-sightings

Last synced: 13 May 2025

https://github.com/turingtest37/sequencerj.jl

Julia-language port of the Sequencer algorithm, originally developed in python (https://github.com/dalya/Sequencer). The Sequencer finds trends in 1-dimensional data sets and has been used by its original authors for data analysis in astrophysics, seismology, image processing, etc. Contributions are welcome!

analysis data-science julia julia-language julia-library trend

Last synced: 07 May 2025

https://github.com/jessecambon/jessecambon.github.io

My blog

data-science r web

Last synced: 17 Feb 2026

https://github.com/immunogenomics/amp_phase1_ra_viewer

🌻 View single-cell RNA-seq and mass cytometry data in synovial tissues from patients with RA or OA.

cytof-data data-science data-visualization r rna-seq-data shiny-apps single-cell-rna-seq

Last synced: 27 Jun 2025

https://github.com/mateuszk098/kaggle-notebooks

Bunch of notebooks collection from Kaggle competitions.

data-science deep-learning jupyter-notebook kaggle kaggle-competition lightgbm machine-learning machine-learning-algorithms neural-networks notebook numpy pandas python python3 pytorch scikit-learn supervised-learning tensorflow unsupervised-learning xgboost

Last synced: 12 Apr 2025

https://github.com/cosmoduende/r-lego

StrangeR things: Building 2D and 3D models… with LEGO bricks? in R. How to emulate and visualize LEGO bricks in 2D and 3D with the "brickr" package in R

brickr data-analytics data-science data-visualization dataviz lego lego-sets lego-universe r-language r-library r-package r-programming r-script r-studio rstats rstats-package rstudio

Last synced: 11 Apr 2025

https://github.com/kumpatlapavankumar/leetcode-dbms

LeetCode solutions using Mysql

computer-science data-science database-management enjoy-coding leetcode leetcode-solutions mysql

Last synced: 31 Jul 2025

https://github.com/negativenagesh/spam-ham_email_detection_machine_learning

This project focuses on classifying spam/ham emails, using machine learning algorithms like LGR, NB, RF, DT etc.. and based on the accuracy score and precision score I chose logistic regression for the classification. And I have used streamlit for frontend.

app data-analysis data-cleaning data-engineering data-science data-visualization data-visualizations jupyter-notebook logistic-regression machine-learning modeling naive-bayes-classifier nlp python

Last synced: 12 Apr 2025

https://github.com/shuyib/teaching_data_collection

Learn data collection by putting a couple of things into consideration

best-practices data-collection data-science data-structures data-visualization makefile matplotlib pandas-dataframe polars-dataframe

Last synced: 22 Mar 2025

https://github.com/mch-fauzy/data-science

Repository containing portfolio of data science and machine learning projects. Presented in the form of iPython Notebooks

data-analysis data-science data-visualization ipython-notebooks machine-learning natural-language-processing portfolio

Last synced: 24 Sep 2025

https://github.com/sblack4/microsoft-professional-program-data-science

Notes📝 from the Microsoft Professional Program Data Science track offered on edx.org

data-science edx-course machine-learning microsoft mooc notes python

Last synced: 05 Mar 2026

https://github.com/mxagar/mlflow_guide

My personal notes on how to use MLflow, compiled after following courses & tutorials, and after making personal experiences.

data-science guide machine-learning mlflow mlops tracking tutorial

Last synced: 20 Aug 2025

https://github.com/siyovush-hamidov/titanic-ml-from-disaster

🚢 Titanic ML: Predict survival on the Titanic with machine learning. Beginners' challenge on Kaggle.

data-science python streamlit

Last synced: 06 May 2026

https://github.com/ivanprodaiko94/ucu-computer-vision-course

This repo contains implementation of computer vision algorithms and solutions to tasks assigned on the course

computer-vision data-science machine-learning machine-learning-algorithms object-detection object-tracking python ucu

Last synced: 07 May 2026

https://github.com/kyle-wannacott/image-annotation-tools

Speed up image selection, tagging, annotation and bounding boxing of relevant images to then use in machine learning models.

annotation annotation-tool data-science image-processing image-recognition machine-learning opencv opencv-python python3 tagging-tool

Last synced: 07 May 2026

https://github.com/adityashrm21/adult-income-prediction

A end-to-end data analysis pipeline including model deployment

data-science eda flask heroku logistic-regression r scikit-learn tidyverse

Last synced: 29 Apr 2026

https://github.com/alan-turing-institute/skills

The core repository for learning & skills materials developed by the the Alan Turing Institute.

ai alan-turing-institute courses-resource data-science learning-resources open-source skills

Last synced: 05 Mar 2026

https://github.com/pegah-ardehkhani/one-hidden-layer-neural-network-from-scratch

"One Hidden Layer Neural Network" from Scratch

data-science deep-learning from-scratch from-scratch-in-python hidden-layers machine-learning neural-network

Last synced: 27 Feb 2026

https://github.com/rsharifnasab/amirzahelper

a program to find meaningful persian words with given chars, for help in mirza game

data data-mining data-science dataset game mirza python3

Last synced: 04 Jun 2026

https://github.com/milos-agathon/protest_map

How to make an animated bubble map of Europe using <150 lines of R code

acled-data bigdata coding data-science data-visualization europe geospatial gis maps protest-events rstats

Last synced: 04 Apr 2026

https://github.com/sukanyabag/gcp-ai-notebooks

This repository contains all practice notebooks with which I performed hands-on labs in Google Cloud Training Program's "Cloud ML-AI Track"

bigquery cloudml-samples data-science dataprep tensorflow-tutorials

Last synced: 08 Feb 2026

https://github.com/danielvartan/r-course

🚀 An Introduction to the R Programming Language

data-engineering data-science data-visualization education open-science open-source presentations quarto r-programming reproducible-research rstats slides statistical-modeling tidyverse

Last synced: 09 Feb 2026

https://github.com/pegah-ardehkhani/flight-price-eda-and-prediction

Analyze and Predict the Flight Price Using Machine Learning Models and Plotly Library

data-science data-visualization exploratory-data-analysis feature-importance flight-price flight-price-prediction machine-learning machine-learning-algorithms plotly prediction regression regression-algorithms statsmodels

Last synced: 15 Feb 2026

https://github.com/mohd-faizy/ml-ds-onenote

Machine-Learning/Data-Science in one Notebook

data-science datascience-machinelearning logistic-regression machine-learning matplotlib-pyplot one-note pandas sklearn statistics

Last synced: 27 Feb 2026

https://github.com/milos-agathon/unemployment_europe_map

How to make a choropleth map of Europe using Eurostat data and <200 lines of code

choropleth-map data-science data-visualization europe eurostat-data rstats unemployment

Last synced: 04 Apr 2026

https://github.com/joewood/spotify-lab

Jupyter Notebook and Lab for Spotify Library

data-science jupyter-notebook notebook pandas python spotify

Last synced: 06 Mar 2026

https://github.com/lynxkite/lynxkite-2000

GPU-accelerated graph analytics and data science with a friendly face

data-pipelines data-science graph

Last synced: 27 Mar 2026

https://github.com/tirendazacademy/pandasai-tutorials

Tutorials for PandasAI

ai data-analysis data-science data-visualization llms openai pandas pandasai python

Last synced: 27 Mar 2026

https://github.com/m-dadej/bikesharingrebalancing.jl

Library for solving and analyzing bike-sharing rebalancing problems

algorithm data-science operational-research operations-research

Last synced: 19 Mar 2026

https://github.com/tushar365/banking_prediction_classification

Want to boost your bank's term deposit sales? This clever system predicts which customers are most likely to say "yes" to a term deposit, letting you target them with personalized calls. ️ No more cold calls! Just happy customers locking in great rates.

data-science decision-trees knn-classification logistic-regression machine-learning matplotlib-pyplot numpy pandas seaborn

Last synced: 27 Mar 2026

https://github.com/rmbl-sdp/rsdp

R Interface for Spatial Data in the RMBL Spatial Data Platform

data-science dataset rstats spatial-data spatio-temporal-data

Last synced: 17 Apr 2026

https://github.com/sipemu/fdars

Functional Data Analysis in R and Rust - High-performance FDA algorithms including depth measures, metrics, clustering, smoothing, and regression

data-science fda functional-data-analysis r rust statistics

Last synced: 04 Apr 2026

https://github.com/omkarpattnaik8080/clothingclassification

"Developing a deep learning model for fashion classification, distinguishing clothing items with high accuracy, leveraging convolutional neural networks for image recognition and feature extraction."

cnn-keras data-science deep-learning machine-learning tensorflow

Last synced: 10 Feb 2026

https://github.com/lightbluetitan/neurodatasets-py

The neurodatasets package provides a curated collection of neuroscience and brain-related datasets for data analysis, statistical modeling, and machine learning research. It includes datasets related to biomedical voice recordings, MRI brain imaging, Alzheimer's and Parkinson's disease biomarkers, epilepsy seizures, ADHD symptoms

alzheimer alzheimers-disease brain data-science datascience datasets datavisualization dataviz epilepsy machine-learning neurons neuroscience opensource parkinsons-disease python python-library research statistics

Last synced: 03 Jun 2026

https://github.com/marouane-elgoumiri/linkedin_mining_data

Linkedin Connections & invites data mining

colab-notebook data-mining data-science graph matplotlib pandas python3

Last synced: 15 Mar 2026

https://github.com/floydwch/kddcup2017

data-science kdd kddcup2017 machine-learning

Last synced: 13 Jul 2025

https://github.com/ivangabriele/docker-fastchat

[Work In Progress] Server/Cloud-ready FastChat Docker images.

ai ai-chatbot artificial-intelligence chat-gpt chatgpt cloud data-science docker docker-compose fastchat llama lmsys script server vicuna vicuna-13b vicuna-7b

Last synced: 15 Mar 2025

https://github.com/jmcheon/algo_ai_data_branch

Algo AI Data branch is a collection of submodules, each representing a unique project from Ecole 42.

algorithm data-science machine-learning python3

Last synced: 13 May 2025

https://github.com/omni-us/narchi

A neural network architecture definition package

ai artificial-intelligence configuration data-science deep-learning machine-learning neural-networks pytorch

Last synced: 23 Apr 2025

https://github.com/omarsar/text_mining_lab_2017

Requirements for Text Mining Summer Course (Lab Session)

ai data-minig data-science deep-nlp machine-learning nlp text-mining word2vec

Last synced: 10 Apr 2025

https://github.com/ritreshgirdhar/apriori-algorithm

Data Mining show frequently bought related Item - For forecasting shelf item to continue retail growth

apriori-algorithm apriori-algorithm-python data-science datamining

Last synced: 08 Apr 2025

https://github.com/javaidiqbal11/time-series-forecasting-using-arima-sarima

This repo for time series forecasting using ARIMA and SARIMA models with Python 3.x

arima-model data-science forecasting-models python3 sarima-model time-series

Last synced: 08 Sep 2025

https://github.com/sondosaabed/preprocessing-for-machine-learning-in-python

DataCamp inetrmediate course on how and when to perform data preprocessing in any machine learning project to get the data ready for modeling

data-preprocessing data-science data-scientist datacamp-course machine-learning machine-learning-pipeline python

Last synced: 09 Apr 2025

https://github.com/sondosaabed/datacamp-data-scientist-track

26+ Hourse of learning Data Science with Python and SQL career track. To prepare for the Data Scientist with Python Certification

data-science datacamp intermediate-sql joining machine-learning python python-packages sql

Last synced: 09 Apr 2025

https://github.com/choaib-elmadi/datasciencecoursera

This repo was create as a part of an exercise in a Coursera course.

cousera data-science rprogramming

Last synced: 02 Jan 2026

https://github.com/bgr8/makine-ogrenmesi

Machine Learning with Python

data-science hierarchical-clustering k-means-clustering knn-classification linear-regression logistic-regression machine-learning multiple-linear-regression nlp-machine-learning polynomial-regression python

Last synced: 14 Aug 2025

https://github.com/timetoai/timediffusion_synth

Research Project on synthetic time-series generation

data-science deep-learning machine-learning pytorch synthetic-time-series time-series

Last synced: 18 Mar 2025

https://github.com/dataship/collimate

Turn a CSV into a simple columnar data store that can be beam'd into a frame

column-store csv data-science javascript

Last synced: 13 Jun 2025

https://github.com/nazchanel/fake-news-detection-webapp

A Flask webapp that detects fake news with a given text input using the power of Natural Language Processing. Deployment on Heroku failed due to the program's large memory consumption.

data-science dataset keras keras-tensorflow machine-learning natural-language-processing nlp nlp-machine-learning python scikit-learn tensorflow

Last synced: 06 Mar 2026

https://github.com/natanfeitosa/kohi

A powerfull schema validator

data-science python3 schema-validation validation

Last synced: 17 Jan 2026

https://github.com/ynikitenko/lena

Lena is an architectural framework for data analysis

analysis-framework analysis-pipeline data-analysis data-science

Last synced: 30 Apr 2025

https://github.com/shcheklein/ensemble-dvc-template

Skeleton for DVC pipeline to evaluate multiple models together

data-science dvc dvc-pipeline ensemble ensemble-machine-learning ensemble-model machine-learning pipeline

Last synced: 11 Apr 2025

https://github.com/croach/jupyter_report_starter_kit

A starter kit for crafting reports based on Jupyter notebooks

data-science jupyter-notebook python reproducible-research

Last synced: 14 May 2026

https://github.com/bradleyboehmke/uc-bana-7025

Additional resources for the UC BANA 7025 Data Wrangling course

data-science data-visualization data-wrangling r

Last synced: 13 Apr 2025

https://github.com/wahyudesu/house_price_prediction

data-science python regression

Last synced: 14 Jun 2025

https://github.com/marcosalvalaggio/edamame

Exploratory data analysis tools

classification data-analysis data-science explainable-ai exploratory-data-analysis exploratory-data-visualizations feature-engineering machine-learning pandas pypi-package regression sklearn-library

Last synced: 12 Jun 2025

https://github.com/umitkaanusta/fraudringdetection-trustnetworks-trying-new-approach

Detecting fraud rings in a p2p trust network with high AUC score (better than 9 of 10 well-known algorithms)* using basic and intuitive trust metrics

data-science fraud fraud-detection graph graph-theory machine-learning network network-science social-network-analysis

Last synced: 27 Mar 2025

https://github.com/vsimkus/vae-conditional-sampling

[TMLR] Research code for the paper "Conditional Sampling of Variational Autoencoders via Iterated Approximate Ancestral Sampling".

conditional-sampling data-science importance-sampling incomplete-data mcmc missing-data vae

Last synced: 30 Jun 2026

https://github.com/codenamewei/technical-posts

Centralized repository for resources of technical posts of substack site.

artificial-intelligence data-science machine-learning

Last synced: 17 Jan 2026

https://github.com/universaldatatool/courseware

Create instructions for labeling datasets using the Universal Data Tool

annotators courseware data-science dataset hacktoberfest label

Last synced: 19 Apr 2025

https://github.com/onlyphantom/textcomplete

A next word prediction app ala Swiftkey

data-science datascience ngrams r rsqlite shiny shiny-apps sqlite textmining

Last synced: 09 Apr 2025

https://github.com/samarthgarge/30-days-of-datascience

📊 30 Days of Data Science is a daily challenge to guide you through Data Science essentials. From basics to advanced, this repo offers clear examples, practical exercises, and resources to help you master Data Science, one day at a time. Whether you're new or refining your skills, this challenge has something for you. Join the journey now! 🚀

data-science decision-trees exploratory-data-analysis hyperparameter-tuning joblib k-means-clustering linear-regression logistic-regression machine-learning natural-language-processing numpy pandas pipeline pipelines python3 scikit-learn seaborn time-series-forecasting

Last synced: 10 Apr 2025

https://github.com/maksimekin/umd_data_challange_2020

Ocean Clean up data analysis project for the UMD Data Challenge 2020. Data Exploration for a Sustainable Planet.

cleanup competition data-analysis data-science folium geolocation machine-learning ocean planet pollution sklearn sustainability time-series trash umd

Last synced: 05 Jul 2025

https://github.com/avinashkranjan/basic-data-analysis-and-visualization-in-python

📊 Some of the most important python tools in data science for Data Analysis and Data Visualization.

data-analysis data-science matplotlib matplotlib-pyplot numpy pandas plotly seabourne

Last synced: 30 Oct 2025

https://github.com/agamiko/100-days-of-code

My 100 days journey with coding to improve my Machine Learning, Deep Learning, Data Science skills

acoustics computer-vision data-science deep-learning image-processing machine-learning natural-language-processing neural-networks

Last synced: 05 Jan 2026

https://github.com/codingforentrepreneurs/jupyter-x-docker

Jupyter Notebook x Docker to Production on Heroku

data-science deployment docker docker-com heroku jupyter jupyter-notebook jupyter-server production python tutorial

Last synced: 18 Jan 2026

https://github.com/amineouerfellii/econometron

A Python package for time series forecasting and economic analysis, providing tools for simulation, estimation, and model evaluation with a focus on scalability and research applications.

data-science deep-learning dsge-models econometrics forecasting localprojections macroeconometrics prediction projection-methods time-series

Last synced: 02 Apr 2026

https://github.com/vatshayan/neural-network-cryptography-project

Increase of Security through Combination of Neural Network and Cryptography.

btech college collegeproject crypto cryptography cryptography-project data-science dataset final final-year-project neural neural-network neural-network-project neural-networks project python research semester semproject university

Last synced: 28 Oct 2025

https://github.com/louis-heraut/card

🎴 Card of Analyse and Diagnostic in R for a user-friendly experience of data aggregation with parametrisation file.

aggregation climate-change climate-data climate-science data-analysis data-science diagnostic environment environment-variables hydrology hydrology-statistical inrae r statistics tools user-friendly

Last synced: 09 Mar 2026

https://github.com/ahammadmejbah/apprenticeship-in-python-for-machine-learning-and-data-science

In recent years, Python's popularity has skyrocketed, making it one of the most sought-after languages for software development. This is because of its user-friendliness, adaptability, and capacity for processing massive volumes of data. Python is highly recommended for use in AI, data science, and machine learning.

classification clustering data data-science deep-learning dimensionality-reduction machine-learning neural-network pandas python regression reinforcement-learning

Last synced: 04 Sep 2025

https://github.com/mindful-ai-assistants/sp2024-election-analysis

📊 An analysis of voting patterns in São Paulo's 2024 elections, focusing on voter behavior, absenteeism, and geographic trends.

beautifulsoup dashboards data-analysis data-cleaning-and-preprocessing data-science dataset-creation datavisualization election-sp-brazil-2024 geolocalization geolocation geolocator maps oneness-consciousness power-bi python web-scraping-python

Last synced: 14 Apr 2025

https://github.com/alextanhongpin/data-science-learn

Things I learn about data science

clustering data-science machine-learning naive-bayes python statistic

Last synced: 10 Apr 2025

https://github.com/ziaeemehr/cpp_workshop

Scientific programming toolbox with C++

cpp data-analysis data-science learning-by-doing programming scientific-computing telegram-channel youtube

Last synced: 15 May 2026

https://github.com/dataket/unblind

Proyecto para el Datatón anticorrupción 2022 - By Dataket 🔥

corruption data-engineering data-science dataviz etl json open-source python streamlit

Last synced: 22 Apr 2025

https://github.com/owlbarn/tutorial

Owl Tutorial

analytics book data-science functional-programming numerical ocaml owl scientific-computing tutorials

Last synced: 03 May 2025

https://github.com/juliasouz/julia-projects

A collection of projects developed in Julia for learning and practice.

data-science julia julia-language julialang scientific-computing

Last synced: 10 Apr 2025

https://github.com/fahim1049/data-structure-and-algorithm

Data Structure and Algorithm

array array-manipulations binary data data-science linear peek pop push search-algorithm stack structures

Last synced: 24 Apr 2025

https://github.com/ttiagojm/ground-truth-vs-prediction

Machine and Deep Learning notebooks

data-analysis data-science deep-learning kaggle machine-learning opencv tensorflow

Last synced: 22 Apr 2025

https://github.com/mindinventory/mrmst-main

Introducing MRMST – Your go-to solution for analyzing investment portfolio risks on the fly. Whether it's the break of dawn, midnight, or right after a trade, seize control of your portfolio with unprecedented ease and precision.

artificial-intelligence data-science financial-analysis machine-learning python stock-market streamlit

Last synced: 09 Jul 2025

https://github.com/amstuta/pylearning

Simple high-level machine-learning library in Python

data-science decision-trees machine-learning nearest-neighbors python-library random-forest

Last synced: 08 Apr 2025

https://github.com/kadyb/geoinf2022

Konferencja Geoinformacja 2022 Warsztaty: "Dane przestrzenne w uczeniu maszynowym - środowisko R"

data-science geospatial gis machine-learning r

Last synced: 15 Mar 2025

https://github.com/bjpop/gurita

A convenient and expressive tool for data analytics and plotting on the command line

command-line data-analysis data-science pandas plotting python

Last synced: 04 Feb 2026

https://github.com/natanast/tidytuesday

This repository includes my participation in the TidyTuesday challenge.

data-science data-visualization rprogramming tidytuesday

Last synced: 28 Oct 2025

https://github.com/rhenkin/visxhclust

A Shiny app and functions for visual exploration of hierarchical clustering.

clustering data-analysis data-science r r-package r-shiny rstats shiny-apps

Last synced: 02 Apr 2025

https://github.com/nguyenanht/john-toolbox

This is my own toolbox to explore data science

data-science machine-learning pipeline python pytorch scikit-learn

Last synced: 10 Apr 2025

https://github.com/deuteronomy-works/soloman

For the love of Artificial Intelligence, Python and QML

artificial-intelligence data-science data-visualisation image-recognition machine-learning opencv python qml

Last synced: 22 Apr 2025

https://github.com/thecoderpinar/earthquake_prediction_analysis_project

🌍 Welcome to the Earthquake Prediction Analysis Project! 🚀 This project aims to predict earthquake magnitudes using LSTM neural networks and analyze seismic data. Explore, analyze, and forecast earthquakes with ease! 📈🔮

analysis data-analysis data-science earthquake-prediction geocoding geology lstm lstm-neural-networks machine-learning matlab matlab-deep-learning open-source time-series visualization

Last synced: 16 Aug 2025

https://github.com/amatofrancesco99/organic-fertilizers-detection

Detection of organic fertilizers (manure) application on crop fields leveraging satellite data and Machine Learning.

agriculture data-science earth-observation fertilization machine-learning python satellites

Last synced: 14 Jul 2025

https://github.com/yuval-a/deriveODM

DeriveODM is a reactive ODM - Object Document Mapper - framework, a "wrapper" around MongoDB, that removes all the hassle of data-persistence by handling it transparently in the background, in a DRY manner.

collection data data-mapper data-science database db document dry mapper mongo mongodb mongoose node nodejs object odm persistence persistent react reactive