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.
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.
GlobaLeaks
Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.