• Jocko - a Kafka/distributed commit log service in Go. [Serf + Raft
• oklog - a distributed and coordination-free log management system for big ol' clusters [Archived
• elasticell - a distributed HA Redis-compatible NoSQL database with strong consistency and reliability
• Apache HBase - a Hadoop database, a distributed, scalable, big data store
• Tair - a high-performance and high-availability distributed fast-access memory (MDB)/persistent (LDB) storage service
• immudb - an immutable database based on zero trust, Key/Value & SQL, tamperproof, data change history
• CouchDB - a highly available, partition tolerant, eventually consistent document database - master setups with automatic conflict detection.
• toydb - distributed SQL database in Rust, written as a learning project
• DB3 Network - a decentralized firebase firestore alternative
• ZODB - an ACID transactional object-oriented database
• requiemdb - a permanent storage for OTEL data

Key-Value Databases

• memcached - a high performance multithreaded event-based key/value cache store intended to be used in a distributed system
• redis - an in-memory database with various value types that persists on disk
• TiKV - a distributed transactional key-value database, originally created to complement TiDB
• leveldb - a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values
• goleveldb - a LevelDB implemented in Golang
• summitdb - an in-memory, NoSQL key/value database. It persists to disk, uses the Raft consensus algorithm, is ACID compliant, and built on a transactional and strongly-consistent model - defined JS scripting
• pupdb - a simple file-based key-value database
• pickledb - an open source key-value store using Python's json module
• KeyDB - a faster drop-in multithreaded alternative to Redis
• Dragonfly - an in-memory data store fully compatible with Redis and Memcache and designed using modern algorithms
• BadgerDB - an embeddable, persistent and fast key-value (KV) database written in pure Go
• BuntDB - a low-level, in-memory, key/value store in pure Go.
• ConstDB - a redis-like cache store that implements CRDTs and active-active replications.
• GhostDB - a distributed, in-memory, general purpose key-value data store that delivers microsecond performance at any scale
• Hive - a lightweight and blazing fast key-value database written in pure Dart. Inspired by Bitcask
• PumpkinDB - an immutable Ordered Key-Value Database Engine
• FlashDB - a simple, in-memory, key/value store in pure Go.
• Lazer - a PHP flat file database based on JSON files
• Scribble - a tiny JSON database in Golang
• FlyDB - a high-performance KV storage engine based on bitcask paper supports redis protocol and the corresponding data structure
• Engula - a distributed key-value store, used as a cache, database, and storage engine
• Dice - an extremely simple Golang-based in-memory KV store that speaks Redis dialect

Relational, SQL, NewSQL Databases

• CockroachDB - a distributed fault-tolerant SQL database built on a transactional and strongly-consistent key-value store
• YugabyteDB - a cloud native distributed SQL database for mission-critical applications
• RQLite - a lightweight, distributed relational database, which uses SQLite as its storage engine
• Kingbus - a distributed MySQL binlog store based on raft [Raft
• YDB is an open-source Distributed SQL Database that combines high availability and scalability with strict consistency and ACID transactions
• RadonDB - an open source, Cloud-native MySQL database for unlimited scalability and performance

NoSQL, Document Databases

• MongoDB - document database designed for ease of development and scaling
• FerretDB - an proxy, converting the MongoDB 6.0+ wire protocol queries to SQL - using PostgreSQL as a database engine
• LiteDB - NoSQL Document Store in a single data file
• tinydb - a lightweight document oriented database written in pure Python
• SleekDB - a simple flat file NoSQL like database implemented in PHP without any third-party dependencies that store data in plain JSON files
• BonsaiDB - an ACID, transactional KV or document dev-friendly database with configurable delayed on-disk data storing
• CloverDB - a lightweight document-oriented NoSQL database written in pure Golang
• SleekDB - a simple flat file NoSQL like database implemented in PHP without any third-party dependencies that store data in plain JSON files

Graph Databases

• neo4j - Graph Database
• edgedb - a graph-relational database
• nebula - a distributed, fast open-source graph database featuring horizontal scalability and high availability
• EliasDB - a graph-based lightweight database

Time Series

• VictoriaMetrics - fast, cost-effective monitoring solution and time series database
• influxdb - scalable datastore for metrics, events, and real-time analytics
• trino - fast distributed SQL query engine for big data analytics
• Apache Doris - an easy-to-use, high performance and unified analytics database
• tstorage is a lightweight local on-disk storage engine for time-series data with a straightforward API
• CnosDB is a high-performance, high-compression, and easy-to-use open-source distributed time-series database. Used in fields such as IoT, industrial internet, connected cars, and IT operations
• LinDB - a scalable, high performance, high availability distributed time series database
• FiloDB - a distributed, prometheus-compatible, real-time, in-memory, massively scalable, multi-schema time series / event / operational database

Column Databases

• Apache Cassandra - a highly-scalable partitioned row store. Rows are organized into tables with a required primary key
• scylladb - a real-time big data database that is API-compatible with Apache Cassandra and Amazon DynamoDB
• FrostDB - an embeddable wide-column columnar database written in Go

Permission Databases

• SpiceDB - a Google Zanzibar-inspired, database system for creating and managing security-critical application permissions
• Keto - a Google Zanzibar-inspired open source database, gRPC, REST APIs, newSQL, and an easy and granular permission language. Supports ACL, RBAC

Analytical Databases

• BaikalDB is a distributed HTAP MySQL-compatible database designed for petabytes scale
• AresDB - a GPU-powered real-time analytics storage and query engine

Vectors

• Qdrant - a vector similarity search engine and vector database
• milvus - an open-source vector database built to power embedding similarity search and AI applications
• Weaviate - an open source vector database that stores both objects and vectors
• tobias-mayer/vector-db - a simple vector database that can be used to search for similar vectors in logarithmic time
• DANNY - a decentralized vector database for building vector search applications

Vectors

• Glide - an open reliable fast LLM/model gateway for rapid development of GenAI apps
• Traefik - a cloud-native app proxy
• Kong - a cloud-native feature-rich API gatewat
• Skipper - an HTTP router and reverse proxy for service composition
• janus - a lightweight API gateway and management platform
• Lura - ultra performance API gateway with middlewares
• MLFLow Gateway - an LLM proxy

Vectors

• etcd - distributed reliable key-value store for the most critical data of a distributed system [Raft + gRPC
• Apache Zookeeper - highly reliable distributed coordination
• chubby - A (very simplified) implementation of Chubby, Google's distributed lock service

Vectors

• Kafka - a distributed, highly scalable, elastic, fault-tolerant, and secure event streaming platform
• faust - a distributed stream processing library that ports the ideas from Kafka Streams to Python
• Liftbridge - a lightweight, fault-tolerant message streams by implementing a durable stream augmentation for the NATS messaging system
• RisingWave - a distributed SQL database for stream processing, designed to reduce the complexity and cost of building real-time applications

Vectors

• dkron - a distributed, fault tolerant job scheduling system for cloud native environments
• Celery - a distributed task queue
• Apache Airflow - a platform to programmatically author, schedule, and monitor workflows

Vectors

• nsq - realtime fault tolerant distributed messaging platform designed to operate at scale, handling billions of messages per day [Raft + gRPC
• Sandglass - distributed, horizontally scalable, persistent, time ordered message queue
• dnpipes - distributed version of Unix named pipes comparable to AWS SQS
• GatewayWorker - distributed realtime messaging framework based on workerman
• ZeroMQ - abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more
• Apache Pulsar - distributed pub-sub messaging platform with a very flexible messaging model and an intuitive client API
• Apache ActiveMQ - high performance Apache 2.0 licensed Message Broker

Vectors

• ElasticSearch - distributed, RESTful search and analytics engine
• Apache Lucene - a high-performance, full featured text search engine library
• MeiliSearch - Lightning Fast, Ultra Relevant, and Typo-Tolerant Search Engine
• FlexSearch - memory-flexible full-text search library
• RiotSearch - distributed, Simple and efficient full text search engine
• Typesense - fast, typo tolerant, fuzzy search engine
• Sonic - fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM

Vectors

• JuiceFS - Hadoop-compatible AWS S3-compatible high-performance POSIX file system
• GlusterFS - distributed storage that can scale to several petabytes
• GlusterFS - highly reliable, scalable and efficient distributed file system
• SeaweedFS - a simple Hadoop-compatible AWS S3-compatible distributed highly scalable distributed file system

Vectors

• sleuth - master-less peer-to-peer autodiscovery and RPC between HTTP services that reside on the same network

Vectors

• Apache Spark - unified analytics engine for large-scale data processing

Vectors

• terminusdb - distributed database with a collaboration model

Vectors

• HarveyOS - distributed operating system

Vectors

• gosiris - an actor framework for Golang
• cotyledon - a framework for defining long-running services - notify, rate limiting for worker spawning, and more.
• atomix - fully featured framework for building fault-tolerant distributed systems [REST + Raft
• orbit - virtual actor framework for building distributed systems
• hemera - A Node.js microservices toolkit for the NATS messaging system [RPC
• Tooz - centralizing the most common distributed primitives like group membership protocol, lock service and leader election by providing a coordination API helping developers to build distributed applications
• Nebula - powerful framework for building highly concurrent, distributed, and resilient message-driven applications
• Service Weaver - A framework that allows to write applications as modular binary and deploy it as a set of microservices
• Dapr - portable, serverless, event-driven runtime that works as a sidecar and makes it easy for developers to build resilient, stateless and stateful microservices

Vectors

• Dragonboat - a high performance multi-group Raft consensus library in pure Go
• Golimit - Uber ringpop based distributed and decentralized rate limiter
• Tenacity - general-purpose retrying library
• ex_hash_ring - pure Elixir consistent hash ring implementation based on the excellent C hash-ring lib
• raft - Raft consensus implementation
• NuRaft - Raft implementation derived from the cornerstone project
• Hyx - Lightweight fault tolerance primitives for your resilient and modern Python microservices
• Migdalor - a Kubernetes native peer discovery for Python asyncio nodes
• skiplist - a Golang implementation of the skiplist data structure
• Waltz - a quorum-based distributed write-ahead log for replicating transactions
• raft - Raft consensus implementation

Vectors

• awesome-scalability - Reading list for illustrating the patterns of scalable, reliable, and performant large-scale systems
• awesome-distributed-systems - curated list on awesome material on distributed systems
• awesome-database-learning - a list of learning materials to understand databases internals
• Writing a sqlite clone from scratch in C
• Build Your Own Redis with C/C++
• Berkley CS186: Intro into Database Systems
• MIT 6.830: Database Systems