Animation

• Universal Tween Engine - A port of the original java Universal Tween Engine created by Aurelien Ribbon.
• Spine Dart - An implementation of the Esoteric Software Spine runtime.

Client Web App Frameworks

• AngularDart Community - Community-maintained AngularDart websites, packages, tools, and more!
• Flutter - Flutter is a framework to build high-performance, cross-platform mobile apps, allowing applications to be written for Android, iOS and Web Apps.
• OverReact - A library for building statically-typed React UI components.
• MDL/Dart - Material Design Lite for Dart is a framework of components for web developers based on Google's Material Design philosophy.

Community

• Dartlang SubReddit
• Stack Overflow
• Telegram chat (ru-RU)
• Telegram chat (id-ID)
• Gitter Chat Channel

Crash monitoring

• Sentry - Sentry provides self-hosted and cloud-based error monitoring that helps all software teams discover, triage, and prioritize errors in real-time.

Cross-platform development

• universal_html - dart:html that also works in the VM/Flutter.
• universal_io - dart:io that also works in the browser.

Database

• Postgres - A PostgreSQL database driver that uses the extended, binary protocol for more efficient and secure queries.
• SQLJockey - MySQL connector.
• PostgreSQL - PostgreSQL database driver.

Dependency Injection

• Dependencies - A simple and modular dependency injection system which doesn't use mirrors.
• package: inject - Compile-time dependency injection for Dart and Flutter
• Angular DI - Dependency Injection framework by Angular.

Game Development

• DartRocket - DartRocket is a HTML5 game framework written in Dart and which uses the StageXL rendering engine.
• Pixi Dart - A port of the pixi.js rendering engine.
• Ranger - A game engine centered around HTML5 Canvas and a scene graph.
• Flame - A minimalist Flutter game engine.

IDEs, Editors, and Plugins

• VSCode Plugin - Dart support for Visual Studio Code.
• Dart Code - Dart support for Visual Studio Code.
• Sublime Text Package - Sublime Text 3 Dart Package.
• Vim Plugin - Syntax highlighting for Dart in Vim.
• Dart Barrel File Generator - VSCode extension that generates barrel files for Dart projects.
• Module Linker - Chrome Extension that adds direct links to module import statements on GitHub.
• IntelliJ Plugin - Dart plugin from JetBrains for WebStorm, IntelliJ IDEA, PhpStorm, PyCharm, and RubyMine.

Image

• image - Provides server and web apps the ability to load, manipulate, and save images with various image file formats including PNG, JPEG, GIF, WebP, TIFF, TGA, PSD, PVR, and OpenEXR.

Multithreading

• isolator - Isolator offer to you a simple way for creating two-component states with isolated part and frontend part of any kind - BLoC, MobX, ChangeNotifier and others

ORM

• Objectory - Objectory provides typed, checked environment to model, save and query data persisted on MongoDb.

Other Frameworks

• Rapid Open Hardware Development (ROHD) Framework - A framework for describing and verifying hardware.

Package Managers

• Cloudsmith - A fully managed package management SaaS, with support for Dart, Flutter, and much more. [Free for Public/OSS] [$]

Parsers

• PetitParser - PetitParser combines ideas from scannerless parsing, parser combinators, parsing expression grammars and packrat parsers to model grammars and parsers as objects that can be reconfigured dynamically.

Server Frameworks

• Jaguar - A server framework built for speed, simplicity and extensibility.
• Start - Sinatra inspired web framework to serve static files, handle dynamic requests, websockets and create JSON responses.
• Vane - Framework with built-in server runtime environment and middleware system.
• Rikulo Stream - Lightweight web server with request routing, filtering, template engine, WebSocket, MVC design pattern, and file-based static resources.
• Alfred - Minimal ExpressJS-inspired server with routing and middlware.
• Dart Frog - A fast, minimalistic backend framework for Dart.

Template

• mustache_template - A mustache template library that supports dart2js and dart2native.
• jaded - Port of the excellent Jade view engine.
• mason - Tools which allow developers to create and consume reusable templates called bricks.

Testing

• spec - A streamlined testing framework for Dart & Flutter.
• Guinness - A port of the Jasmine library.

Tools

• DevTools - a suite of debugging and performance tools for Dart and Flutter.
• Crossdart - Cross-referenced source code of the packages from Pub.
• Lakos - Visualize internal library dependencies in Graphviz and detect dependency cycles.
• js2dart - compiles Javascript code to Dart.
• gulp-dart - A gulp plugin for compiling Dart code to JavaScript using dart2js.
• webdev_proxy - A proxy wrapper around webdev which adds support for rerouting 404s to the index, allowing for HTML push-based routing while running locally.
• Dart Code Metrics - Additional linter which reports code metrics, checks for anti-patterns and provides additional rules for Analyzer.
• m2cgen - A CLI tool to transpile trained classic ML models into a native Dart code with zero dependencies.
• Stagehand - A project scaffolding generator, inspired by tools like Web Starter Kit and Yeoman.
• dev_compiler - Dart to JavaScript compiler designed to create idiomatic, readable JavaScript output.
• FlutterTrends - Daily download trends, rankings, and repository health for 20k+ Flutter packages on pub.dev.
• Crossdart Github Chrome Extension - Adds "Go to declaration" and "Find Usages" functionality to your Dart projects on Github (both in tree views and pull requests).
• dart2js - compiles Dart code to JavaScript.

Tutorials

• Dart for beginner - Dart Chinese tutorial for beginner.
• Tour of Heroes - An app which covers the core fundamentals of AngularDart.
• Getting Started with Dart & React

Unions

• Freezed - Code generation for immutable classes that has a simple syntax/API without compromising on the features.

Utilities

• Darq - A port of functional LINQ from the .NET library.
• built_collection - Immutable collections via the builder pattern.
• built_value - Immutable value types, enum classes, and serialization.
• Quiver - A set of utility libraries that makes using many libraries easier and more convenient, or adds additional functionality.
• Basics - A Dart library containing convenient extension methods on basic Dart objects.
• route_hierarchical - Route is a client routing library for Dart that helps make building single-page web apps.

Validation

• validator.dart - String validation and sanitization for Dart.

Web Frameworks

• Jaspr - Jaspr is an modern web framework for building websites in Dart with support for both client-side and server-side rendering.