#chat

Spectrum 2

Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks. ([Source Code](https://github.com/SpectrumIM/spectrum2)) `GPL-3.0` `C++`

Stoat

Stoat is a user-first chat platform built with modern web technologies. ([Source Code](https://github.com/stoatchat/self-hosted)) `AGPL-3.0/MIT` `Rust`

Tailchat

Next generation noIM application in your own workspace, not only another Slack/Discord/rocket.chat. ([Demo](https://nightly.paw.msgbyte.com/), [Source Code](https://github.com/msgbyte/tailchat)) `Apache-2.0` `Docker/K8S/Nodejs`

Tox

Distributed, secure messenger with audio and video chat capabilities. ([Source Code](https://github.com/TokTok/c-toxcore)) `GPL-3.0` `C`

Tuwunel

High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit). ([Demo](https://try.tuwunel.chat/), [Source Code](https://github.com/matrix-construct/tuwunel)) `Apache-2.0` `deb/Docker/Nix/Rust`

Zulip

Zulip is a powerful, open source group chat application. ([Source Code](https://github.com/zulip/zulip)) `Apache-2.0` `Python`

ngircd

Portable and lightweight Internet Relay Chat server for small or private networks. ([Source Code](https://github.com/ngircd/ngircd)) `GPL-2.0` `C/deb`

The Lounge

Self-hosted web IRC client. ([Demo](https://demo.thelounge.chat/), [Source Code](https://github.com/thelounge/thelounge)) `MIT` `Nodejs/Docker`

Movim

Modern, federated social network based on XMPP, with a fully featured group-chat, subscriptions and microblogging. ([Source Code](https://github.com/movim/movim)) `AGPL-3.0` `PHP/Docker`

Talkyard

Create a community, where your users can suggest ideas and get questions answered. And have friendly open-ended discussions and chat (Slack/StackOverflow/Discourse/Reddit/Disqus hybrid). ([Demo](https://www.talkyard.io/forum/latest), [Source Code](https://github.com/debiki/talkyard)) `AGPL-3.0` `Docker/Scala`

Converse.js

XMPP chat client in your browser. ([Source Code](https://github.com/conversejs/converse.js)) `MPL-2.0` `Javascript`

Peergos

Secure and private space online where you can store, share and view your photos, videos, music and documents. Also includes a calendar, news feed, task lists, chat and email client. ([Source Code](https://github.com/Peergos/Peergos)) `AGPL-3.0` `Java`

Onyx Community Edition

Chat UI that works with any LLM. It comes loaded with advanced features like agents, web search, RAG, MCP, deep research, Connectors to 40+ knowledge sources, and more. ([Source Code](https://github.com/onyx-dot-app/onyx)) `MIT` `Docker/K8S`

Owncast

Decentralized single-user live video streaming and chat server for running your own live streams similar in style to the large mainstream options. ([Source Code](https://github.com/owncast/owncast)) `MIT` `Go`

Kaiwa

Web based chat client in the style of common paid alternatives.

Lets-Chat

A self hosted chat suite written in Node.

Building a Simple Chat App With Elixir and Phoenix

Building a Simple Chat App With Elixir and Phoenix

Build A Chat App with Sentiment Analysis

Build A Chat App with Sentiment Analysis

Textual

An Internet Relay Chat (IRC) client. [![Open-Source Software][OSS Icon]](https://github.com/Codeux-Software/Textual)

NLM HyperDoc Visible Human Project

Color, CAT and MRI image samples - over 30 images (Formats: jpeg)