Open source communication tools, ranked by score and analyzed honestly. Part of our Self-Hosted & Apps coverage.
Ranked by score. Updated weekly.
Real-time bidirectional event-based communication
Library for Discord bot development
Matrix homeserver for decentralized chat
Team chat with threading
High-performance cloud and edge native messaging system
Open source WebRTC infrastructure
We have made you a wrapper you can't refuse
Open source Slack/Teams alternative
Open source notification infrastructure
Open source live-chat and support desk
A command-line tool for Lark/Feishu Open Platform — built for humans and AI Agents. Covers core business domains including Messenger, Docs, Base, Sheets, Calendar, Mail, Tasks, Meetings, and more, with 200+ commands and 19 AI Agent Skills.
Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.
High-performance async messaging
Self-hosted modern web IRC client
Open source secure collaboration platform
Open source chatbot builder
Photo Sharing. For Everyone.
Open source email platform
云微WOC，云微信，自由连接