Documentation

• Developer Agreement - Twitch Developer Services Agreement.
• Developer Docs - Twitch Developer Documentation.

Extension Starter Kits

Visual Basic .NET

• Breci/twitch-ext-vuex - An abstraction of the Twitch Extension helper for VueX.
• jackmcguire1/Twitch-Extension-VueJS-Template - Has a template for both an EBS written in golang and the front-end for a Twitch panel extension in vueJS.
• muxy/medkit-starter-vue - Starter project for a Vue.js and MEDKit powered extension.
• Colbydude/twitch-extension-vue-laravel-mix-boilerplate - Twitch Extension Boilerplate setup to use VueJS and Laravel Mix.
• tracy-and-matt/twitch-extension-vue-starter - Twitch Extension Vue Starter Kit.

Getting help

• Forum - Announcements, FAQ, RFCs, Events and more.
• TwitchDev Discord Server - Chat with other Twitch developers.
• Twitch Libraries Discord Server - Discover Server with channels organized by programming language.
• Stack Overflow - Stack Overflow is a question and answer site for professional and enthusiast programmers.
• Bug reports - Third party developer product bug reports.
• Feature Requests - Upvote developer experience improvement ideas.
• IGDB Discord Server - Discord Server for Internet Game Database.
• Meetups - Virtual Meetups directory.
• Contact Support - File Twitch Support tickets for general bugs.

Guides and Tutorials

Visual Basic .NET

• Building a Python Twitch bot
• Get started with Twitch Extensions
• Twitch Authentication Guide
• Building a Python Twitch bot

Libraries

Angelscript

• 23rd/TwitchPotPlayer - Extensions for PotPlayer to watch Twitch streams without streamlinks or any crap.
• 23rd/TwitchPotPlayer - Extensions for PotPlayer to watch Twitch streams without streamlinks or any crap.

C

• notr1ch/TwitchTest - Bandwidth tester for Twitch.
• domsson/libtwirc - Twitch IRC library for Linux - no dependencies.

C#

• TwitchLib/TwitchLib - C# Twitch Chat, Whisper, API and PubSub Library. Allows for chatting, whispering, stream event subscription and channel/account modification.
• jdpurcell/RechatTool - Downloads the chat log from a Twitch VOD.
• SaviorXTanren/mixer-mixitup - Streaming bot application for handling chat, events, moderation, and other streamer assistance features.
• Grahnz/TwitchIRC-Unity - Lightweight IRC client component for use with the Unity Engine.
• DevChatter/DevChatterBot - Twitch chat bot.
• VolvoxCommunity/Volvox.Helios - Powerful, modular, web-managed, open-source Discord bot created by a community for communities.
• SaviorXTanren/StreamingClientLibrary - Client library for Twitch, YouTube Live, and other streaming services.
• lexonegit/Unity-Twitch-Chat - Lightweight and easy-to-use Twitch IRC client for Unity projects.
• michidk/TwitchCSharp - Twitch C# Wrapper for the Twitch v3 REST API.
• pendo324/EssentialNowPlaying - A now playing tool intended to be used with OBS.
• SimpleSandman/TwitchBot - Custom C# chat bot for Twitch TV.
• andrxd/TwitchBotChatReader - simple bot that reads the chat to you.
• Cryma/TwitchApi.Net - C# Wrapper for the Twitch Helix API.
• RokuHodo/TwitchNet - Library for all client sided Twitch development features, developed for the C# .NET framework.

C++

• Chatterino/chatterino2 - Chatterino 2 is a chat client for Twitch.tv.
• alamminsalo/orion - Cross platform Twitch.tv client
• mrbandler/TwitchAuth - Unreal Engine 4 Plugin for In-Game Twitch Authentication.
• Phantom139/PhantomBot - Simple cross-platform C++ Twitch Bot with easy to adapt functioning.

Crystal

• sledgang/twitch - Twitch API binding in Crystal.

Elixir

• ryanwinchester/tmi.ex - Twitch Chat Library.
• streamcord/twitch-webhooks-elixir - Simple HTTP server for handling Twitch's webhooks.

Elm

• paramander/elm-twitch-chat - Elm powered Twitch chat using WebSockets.

GDScript

• drtwisted/godot-twicil - Godot Twitch Chat Interaction Layer.

Golang

• Twitch CLI - The official Twitch CLI to make developing on Twitch easier.
• gempir/go-twitch-irc - Go IRC client for twitch.tv.
• nicklaw5/helix - A Twitch Helix API client written in Go.
• mrshankly/go-twitch - Go library for accessing the Twitch API.
• hortbot/hortbot - Twitch IRC bot - the code behind CoeBot, AutoModBot (and of course, HortBot).
• RadiumByte/StreamServer - Server for making and managing RTMP streams from RTSP and webcam sources.
• jrm780/gotirc - Twitch.tv IRC library.
• chelexa/trofiebot - Twitch.tv IRC Chat Bot.
• g33kidd/go-discord-bot - Discord bot built with Go, mostly command handling at the moment.
• pukapy/tcct - Twitch Chat Client for Terminal made in Go.
• TroyDota/modlogs - Bot used to post twitch mod actions into a discord channel.
• StinkingBanana/tut - Twitch Unfollow Tracker.
• sunspots/tmi - Go library for Twitch chat IRC/TMI.
• crabbymonkey/nerf-controller - Designed to run on a Raspberry Pi Zero W connected to a nerf gun or other method of firing projectiles with a user interface via a web app, the program interfaces with StreamLabs to record donations that will add rounds to the hopper to be fired.
• ColeWalker/twitchircgo - Twitch IRC client for Golang.
• Adeithe/go-twitch - Complete interface for Twitch services in Go.
• theorx/go-ttv-pubsub - PubSub api client written in golang.
• jpiontek/bitter-irc - Bitter IRC is a streamlined IRC library specifically designed for Twitch IRC servers written in Go.
• jackmcguire1/go-twitch-ext - Library to help with the development of an EBS for Twitch Extensions.
• tracy-and-matt/go-twitch-pubsub - Go library for Twitch PubSub.
• pukapy/tcct - Twitch Chat Client for Terminal made in Go.
• TroyDota/modlogs - Bot used to post twitch mod actions into a discord channel.

Haskel

• tsoding/HyperNerd - Total Surveillance Automatic Ban Machine for Twitch and Discord.

Java

• twitch4j/twitch4j - Modular Async/Sync/Reactive Twitch API Client / IRC Client.
• chatty/chatty - Chatty is a Twitch Chat Client for Desktop written in Java.
• TwitchRecover/TwitchRecover - Twitch VOD tool which recovers all VODs including those that are sub only or deleted.
• GlitchCog/ChatGameFontificator - Twitch chat display that uses the fonts of various video games.
• SebastianRask/Pocket-Plays-for-Twitch - Open source Twitch client for Android.
• Gikkman/Java-Twirk - Small, basic library for communication via the Twitch chat. Java 8 compatible.
• BatedUrGonnaDie/glitchify - Tweaks for the official twitch.tv android app.
• thibautbessone/DiscordBlueBot - General purpose Discord bot made with love using the Java Discord API (JDA), designed to help small Twitch streamers.
• PhantomBot/PhantomBot - PhantomBot is an actively developed open source interactive Twitch bot with a vibrant community that provides entertainment and moderation for your channel, allowing you to focus on what matters the most to you - your game and your viewers.
• Twasi/twasi-core - Core application and backend of the Twasi chatbot for Twitch.
• SirSkaro/Twitch-Queue-Bot - Application that allows streamers to easily create and manage custom queues for their Twitch channel

JavaScript (Browser Extension)

• trmcnvn/twitch-channel-points - Auto-click those bonus channel points on Twitch.

JavaScript (Node.js)

• tmijs/tmi.js - Connect to and interact with Twitch chat (IRC) from Node.js or a browser.
• osslate/irc-message - Performant, streaming IRC message parser.
• twurple/twurple - Interact with Twitch's API, chat, PubSub and subscribe to WebHooks.
• twitch-js/twitch-js - A community-centric, community-supported version of tmi.js
• sogehige/sogeBot - Free Twitch Bot built on Node.js.
• clarkio/vscode-twitch-highlighter - VS Code extension that will allow your Twitch chat to highlight a line of code via a command message.
• streamwall/streamwall - Display a mosaic of livestreams. Built for streaming.
• skarab42/marv - Marv your Swiss streaming tool.
• kritzware/twitch-bot - Easily create chat bots for Twitch.tv.
• crowbartools/Firebot - Powerful all-in-one bot for Twitch streamers.
• dongy7/twitch-chat-cli - Twitch chat in your terminal.
• freaktechnik/twitch-chatlog - Fetch the chatlog to a twitch VOD from your command line.
• robotty/dank-twitch-irc - Connect to Twitch chat from Node.js.
• clarkio/ttv-chat-bot - Twitch TV chat reader to control colors for overlays from Stream Elements and/or internet connected light bulbs.
• bdougie/git-twitc - Service for GitHub and twitch interaction.
• twitch-desktop/twitch-desktop - Twitch Desktop Client for Windows, OSX and Linux.
• fgl27/smarttv-twitch - Twitch client for Samsung Smart TVs 2015 and newer models.
• nikitakatchik/smarttv-twitch - Twitch app for Samsung Smart TV.
• Supinic/supibot - Multiplatform, utility & novelty chat bot.
• pendo324/universal-np - A now playing tool intended to be used with things like OBS.
• ryancharris/react-livestream - Embed your Twitch, Mixer or YouTube stream in your website automatically when you're live.
• open-sauced/beybot - Twitch bot built with the ComfyJS library.
• true-dubach/node-twitch-webhook - Node.js library for Twitch Helix Webhooks.
• techno-tim/techno-boto-twitch - Full featured Twitch bot you can add to your channel today.
• streamdevs/webhook - Webhook to forward GitHub/GitLab events to StreamLabs Alerts and Twitch Chat.
• builders-club/number-one - Container based Twitch chat bot that provides chat commands, overlays, video interaction and more.
• LeaPhant/pagkibot - Discord bot for instant Twitch live notifications using Twitch's PubSub API.
• mangosango/clive - Webhook server that posts clips in Twitch chat to Discord.
• seveibar/twitch-git-diff-monitor - Let twitch viewers see the last lines of code you changed.
• carlosazaustre/twitch-chat-raspi-leds - Let to Twitch chat users to interact with RaspberryPi LEDs.
• KUNszg/kbot - Twitch chat bot aiming to improve chat experience.
• hpcbot/hpcbot - Twitch bot to make your stream incredibly interactive.
• JamesFrost/twitch-emoji - Parse Twitch emotes.
• best-coloc-ever/twitch-cast - Cast Twitch on your Chromecast.
• Plazide/node-twitch - Wrapper for the Helix Twitch API in NodeJS. Aims to provide methods for all Twitch API endpoints.
• Satont/yakui - Yet another Twitch bot written on typescript.
• alvinbhou/0xDonate - decentralized donation service for streamers, powered by Ethereum.
• Siddhartt/Twitch-Notification-Discord-Bot - Discord bot that uses the Twitch API to send a message whenever a streamer goes live.
• timcole/twitch-points-hue - Allow viewers to change your hue light colour with channel points.
• canova/Twitch-Chat-Bot - Twitch IRC Chat Bot.
• RintarouTW/LaTeX4TwitchChat - Rendering LaTeX in Twitch Chat.
• allpaqa-jgk/twitch_text_to_speech_bot - Text to Speech bot using Twitch IRC.
• Jedidiah/gatsby-source-twitch - Gatsby source to fetch data from the Twitch API.
• GypsyDangerous/twitchio-js - Twitch API wrapper that makes it easier to interact with the Twitch API and other twitch related API's.
• sogehige/sogeBot - Free Twitch Bot built on Node.js.
• DJArghlex/twitch-notifier-bot - Discord bot to notify multiple servers (in set channels) when a Twitch streamer goes live.
• builders-club/number-one - Container based Twitch chat bot that provides chat commands, overlays, video interaction and more.
• Plazide/node-twitch - Wrapper for the Helix Twitch API in NodeJS. Aims to provide methods for all Twitch API endpoints.
• Siddhartt/Twitch-Notification-Discord-Bot - Discord bot that uses the Twitch API to send a message whenever a streamer goes live.

JavaScript (Twitch Extensions)

• muxy/extensions-js - Easy way to build Twitch Extensions using this JavaScript library for interfacing with Muxy's extensions backend.
• lukemnet/twitch-ebs-tools - Utility functions for Twitch Extension Backend Services (EBS).
• lukemnet/twitch-ebs-tools - Utility functions for Twitch Extension Backend Services (EBS).

Kotlin

• frozencure/twitch-client - Twitch API client written in Kotlin. Compatible with Kotlin/JVM - and Android Studio projects.
• wooodenleg/TmiK - Twitch messaging in Kotlin - Simple DSL for interacting with Twitch chat.
• MinnDevelopment/strumbot - Twitch Stream Notification Bot.
• frozencure/twitch-client - Twitch API client written in Kotlin. Compatible with Kotlin/JVM - and Android Studio projects.
• wooodenleg/TmiK - Twitch messaging in Kotlin - Simple DSL for interacting with Twitch chat.

Objective-C

• sbine/TextualKappa - Twitch.tv chat plugin for the Textual IRC client.

PHP

• Twitch Token Generator - Generate tokens for use with the Twitch API and Twitch Chat.
• nicklaw5/twitch-api-php - Twitch API client for PHP.
• romanzipp/Laravel-Twitch - Twitch Helix API PHP Wrapper for Laravel
• ilias-sp/Twitch-Chat-Bot-PHP - full of features bot for Twitch Chat.
• PetterKraabol/laravel-twitch-api - Twitch API for Laravel 5.
• RyanBayne/TwitchPress - TwitchPress is a system of plugins that combines the power of Twitch.tv with WordPress.
• MyTheValentinus/twitch-bot - Library to create Twitch bot using PHP and module system.
• flazer/twitchbot - Just a small and basic PHP twitchbot to send responses based on pattern matching.
• darkain/php-twitch-bot - Simple chat bot for Twitch.
• MyTheValentinus/twitch-bot - Library to create Twitch bot using PHP and module system.

Python

• PetterKraabol/Twitch-Chat-Downloader - Download chat messages from past broadcasts on Twitch.
• ihabunek/twitch-dl - CLI tool for downloading videos from Twitch.
• pajbot/pajbot - Twitch moderation bot.
• KiranGershenfeld/VisualizingTwitchCommunities - Graphing communities on Twitch.tv in a visually intuitive way.
• xenova/chat-downloader - Simple tool used to retrieve chat messages from livestreams, videos, clips and past broadcasts.
• PetterKraabol/Twitch-Python - Object-oriented Twitch API for Python developers.
• tsifrer/python-twitch-client - Python wrapper for Twitch API.
• ContentAutomation/TwitchCompilationCreator - Fully automated system that transforms Twitch clips into gaming compilations.
• offish/twitchtube - Automatically make video compilations of the most viewed Twitch clips and upload them to YouTube using Python.
• andrei-zgirvaci/Twitch-Farmer - Bot that helps you to get more followers on Twitch.
• gottagofaster236/Twitch-Channel-Points-Miner - Simple script that will watch a stream for you and get the channel points.
• BasioMeusPuga/twitchy - CLI streamlink wrapper for twitch.tv.
• harkbound/PythonTwitchBotFramework - Asynchronous twitchbot framework made in pure Python.
• ancalentari/twitch-stream-recorder - Record twitch streams live!
• Teekeks/pyTwitchAPI - Python 3.7 implementation of the Twitch API and its Webhook.
• streamcord/streamcord - Discord bot that interacts with the popular streaming service Twitch.tv
• Bare7a/Streamlabs-Chatbot-Scripts - Collection of Scripts for Streamlabs Chatbot.
• anthonywritescode/twitch-chat-bot - Chat bot for Twitch.
• Harmon758/Harmonbot - Multi-Platform Factotum Bot.
• joshuaskelly/twitch-observer - Turn Twitch chatter into Python events.
• calexil/FightstickDisplay - Simple program written in python and built on pyglet, used to display fightstick inputs on screen for streaming purposes.
• martmists-gh/asynctwitch - Asynchronous twitch chat lib.
• dmadison/OBS-ChatSpam - Python script for OBS Studio that posts messages in Twitch chat.
• BatedUrGonnaDie/salty_bot - Twitch chat bot.
• pelledrijver/twitch-highlights - OS-independent and easy-to-use module for creating highlight videos from trending Twitch clips.
• DaCasBe/TwitchPy - This is a package you can use to connect with the Twitch API, manage a channel, create bots, etc.
• TheWeirdlings/TwitchTube - Open source streaming bot for Youtube and Twitch.
• NMisko/monkalot - Twitch Bot for maximum user interaction and chat spam induction.
• HectorPulido/Deeplearning-based-Twitch-bot - Twitch chatbot based in GPT-2 technology.
• MitchellHarrison/mitchs-twitch-bot - All-in-one Twitch Chatbot and data visualization dashboard.
• parklez/twitch-bot - free, minimal, lightweight, cross-platform, easily expandable Twitch IRC/API bot.
• brajenful/twitch-arduino - Twitch notification system for Arduino.
• ALikhachev/django-simpletwitchauth - Use this simple module to easily enable authorization in your Django application via Twitch API.
• rootmos/twitch-cli - Twitch command line interface.
• twitchapis/twitch.js - Twitchjs is an unofficial powerful Node.js module that allows you to easily interact with Twitch.
• Stateford/twitch-api - Easy node interaction with the twitch API, using promises.
• TwitchIO/TwitchIO - Async Bot/API wrapper for Twitch made in Python.
• MitchellHarrison/mitchs-twitch-bot - All-in-one Twitch Chatbot and data visualization dashboard.
• twitchapis/twitch.js - Twitchjs is an unofficial powerful Node.js module that allows you to easily interact with Twitch.

Ruby

• schmich/kappa - Twitch Ruby API
• mauricew/ruby-twitch-api - Ruby client for the Twitch Helix API.
• anderlechtt/mos_bot - Bot playing Marbles On Stream with Twitch streamers.
• BenStigsen/RubyTwitch - Chatbot for Twitch.
• schmich/unfollowerbot - Track Twitch follows & unfollows.
• craysiii/twitchbot - Twitch bot.

Rust

• udoprog/OxidizeBot - High performance Twitch bot in Rust.
• museun/twitchchat - Interface to the irc portion of Twitch's chat.
• robotty/twitch-irc-rs - Twitch IRC library for the Rust programming language.
• Emilgardis/twitch_api2 - Rust library for talking with the new Twitch API aka. "Helix", TMI and more.
• age-rs/libtwitch-rs - Twitch API library written in Rust.