Rocket.Chat
Communications platform that puts data protection first (alternative to Gitter.im and Slack).
Novu
Notification infrastructure for developers.
ntfy
Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to P…
Zulip
Zulip is a powerful, open source group chat application.
Apprise
Apprise allows you to send a notification to almost all of the most popular notification services available…
Gotify
Notification server with Android and CLI clients (alternative to PushBullet).
Tinode
Instant messaging platform.
Element
Fully-featured Matrix client for Web, iOS & Android.
SimpleX Chat
The most private and secure chat and applications platform - now with double ratchet E2E encryption.
Centrifugo
Language-agnostic real-time messaging (Websocket or SockJS) server.
Screego
Screego is a simple tool to quickly share your screen to one or multiple people via web browser.
Typebot
Conversational app builder (alternative to Typeform and Landbot).
Mumble
Low-latency, high quality voice/text chat software.
WorkAdventure
Virtual office / virtual conference application presented as a 16-bit RPG video game.
Synapse
Server for [Matrix](https://matrix.org/), an open standard for decentralized persistent communication.
One Time Secret
Share sensitive information securely with self-destructing links that are only viewable once.
Tox
Distributed, secure messenger with audio and video chat capabilities.
WBO
Web Whiteboard to collaborate in real-time on schemas, drawings, and notes.
Stoat
Stoat is a user-first chat platform built with modern web technologies.
AnyCable
Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.
Chitchatter
Peer-to-peer chat app that is serverless, decentralized, and ephemeral.
Tuwunel
High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit).
Live Helper Chat
Live Support chat for your website.
RetroShare
Secured and decentralized communication system.