Rocket.Chat Communications platform that puts data protection first (alternative to Gitter.im and Slack). Self-hostedOpen sourceCommunication - Custom Communication Systems 46 343MITNodejsmis à jour le oct. 2026
Novu Notification infrastructure for developers. Self-hostedOpen sourceCommunication - Custom Communication Systems 40 214MITNodejsmis à jour le oct. 2026
Mattermost Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack). Self-hostedGratuitCommunication - Custom Communication Systems 39 454ProprietaryGomis à jour le oct. 2026
Chatwoot Customer communication platform (alternative to Intercom and Zendesk). Self-hostedGratuitCommunication - Custom Communication Systems 38 453ProprietaryRubymis à jour le oct. 2026
ntfy Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify. Self-hostedOpen sourceCommunication - Custom Communication Systems 35 117Apache-2.0Gomis à jour le oct. 2026
Zulip Zulip is a powerful, open source group chat application. Self-hostedOpen sourceCommunication - Custom Communication Systems 26 125Apache-2.0Pythonmis à jour le oct. 2026
SimpleX Chat The most private and secure chat and applications platform - now with double ratchet E2E encryption. Self-hostedOpen sourceCommunication - Custom Communication Systems 19 605AGPL-3.0Haskellmis à jour le oct. 2026
Apprise Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc. Self-hostedOpen sourceCommunication - Custom Communication Systems 17 655MITPythonmis à jour le oct. 2026
OpenWA WhatsApp API gateway exposing messaging as REST endpoints, with a web dashboard, multi-account sessions, and webhook events (alternative to WhatsApp Business API providers). Self-hostedOpen sourceCommunication - Custom Communication Systems 16 317MITDockermis à jour le oct. 2026
Gotify Notification server with Android and CLI clients (alternative to PushBullet). Self-hostedOpen sourceCommunication - Custom Communication Systems 16 136MITGomis à jour le oct. 2026
Element Fully-featured Matrix client for Web, iOS & Android. Self-hostedOpen sourceCommunication - Custom Communication Systems 13 619Apache-2.0Nodejsmis à jour le oct. 2026
T Tinode Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots. Self-hostedOpen sourceCommunication - Custom Communication Systems 13 540GPL-3.0Gomis à jour le sept. 2026
C Centrifugo Language-agnostic real-time messaging (Websocket or SockJS) server. Self-hostedOpen sourceCommunication - Custom Communication Systems 10 926MITGomis à jour le oct. 2026
S Screego Screego is a simple tool to quickly share your screen to one or multiple people via web browser. Self-hostedOpen sourceCommunication - Custom Communication Systems 10 741GPL-3.0Gomis à jour le oct. 2026
Fluxer Instant messaging and VoIP platform built for friends, groups, and communities (alternative to Discord). Self-hostedOpen sourceCommunication - Custom Communication Systems 10 686AGPL-3.0Dockermis à jour le oct. 2026
Typebot Conversational app builder (alternative to Typeform and Landbot). Self-hostedOpen sourceCommunication - Custom Communication Systems 10 583AGPL-3.0Dockermis à jour le oct. 2026
Mumble Low-latency, high quality voice/text chat software. Self-hostedOpen sourceCommunication - Custom Communication Systems 8 369BSD-3-ClauseC++mis à jour le oct. 2026
WorkAdventure Virtual office / virtual conference application presented as a 16-bit RPG video game. Self-hostedOpen sourceCommunication - Custom Communication Systems 5 888AGPL-3.0Dockermis à jour le oct. 2026
Synapse Server for [Matrix](https://matrix.org/), an open standard for decentralized persistent communication. Self-hostedOpen sourceCommunication - Custom Communication Systems 4 738Apache-2.0Pythonmis à jour le oct. 2026
O One Time Secret Share sensitive information securely with self-destructing links that are only viewable once. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 977MITRubymis à jour le oct. 2026
T Tuwunel High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit). Self-hostedOpen sourceCommunication - Custom Communication Systems 2 700Apache-2.0Rustmis à jour le oct. 2026
T Tox Distributed, secure messenger with audio and video chat capabilities. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 696GPL-3.0Cmis à jour le oct. 2026
Stoat Stoat is a user-first chat platform built with modern web technologies. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 679AGPL-3.0Rustmis à jour le oct. 2026
WBO Web Whiteboard to collaborate in real-time on schemas, drawings, and notes. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 674AGPL-3.0Nodejsmis à jour le oct. 2026
AnyCable Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 389MITGomis à jour le oct. 2026
Chitchatter Peer-to-peer chat app that is serverless, decentralized, and ephemeral. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 343GPL-2.0Nodejsmis à jour le oct. 2026
L Live Helper Chat Live Support chat for your website. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 247Apache-2.0PHPmis à jour le oct. 2026
R RetroShare Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer. Self-hostedOpen sourceCommunication - Custom Communication Systems 2 021GPL-2.0C++mis à jour le oct. 2026
GlobaLeaks Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform. Self-hostedOpen sourceCommunication - Custom Communication Systems 1 525AGPL-3.0Pythonmis à jour le oct. 2026
Databag Federated, end-to-end encrypted messaging service for the web, iOS, and Android, supporting text, photos, video, and WebRTC video and audio calls. Self-hostedOpen sourceCommunication - Custom Communication Systems 1 504Apache-2.0Dockermis à jour le juin 2026