Open Source #chat Projects

Self-hosted RAG chatbot platform that answers visitor questions from your website and PDFs, with a two-line embeddable widget and citations.

A free and open source instant messaging and VoIP chat app for friends, groups, and communities.

Self-hosted live video streaming server with built-in chat and Fediverse integration.

Open-source Matrix client for secure, decentralized messaging, voice, and video — runs on your own server.

Open source community forum platform combining long-form discussion, real-time chat, and strong moderation. Self-host it or use managed hosting.

Decentralized private messenger using email infrastructure for secure, end-to-end encrypted communication.

Simple, open source team messaging platform

The communications platform that puts data protection first.

Self-hosted chat server with voice, video, text, and screen sharing — Discord-like features on your own infrastructure.

Low-latency, open-source voice chat built for gaming — self-host your own server with no subscription required.

A self-hosted chat application for teams and communities with video calls, voice calls, and screen sharing.

Open-source AI chat and agent platform with multi-provider support, RAG, plugins, and an agent marketplace — self-hostable ChatGPT alternative.

Instant messaging platform with self-hosted backend in Go and clients for iOS, Android, web, and command line.

Open-source team chat with a unique topic-based threading model that makes it easy to follow multiple conversations.