Franz is a free messaging app for services like WhatsApp, Slack, etc,
The first messaging platform operating without user identifiers
The Leading Open Source Communication Hub | Community Version
Private messenger for Windows, Mac, and Linux
A glossy Matrix collaboration client for the web
Video- & audio-conferencing app for Nextcloud
Android Chat SDK ➜ Stream Chat API. UI component libraries for chat
A free (libre) open source, mobile OS for Ethereum
Free and Open Source messaging and emailing app
Development toolkit for Web Services and XML data bindings for C & C++
Tool for building chat bots, apps and custom integrations
PLEKv2: predicting lncRNAs and mRNAs
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
Smoke: Android Crypto Chat Messenger
The Free & Popular FLARUM Web Software in a Complete Virtual Machine
Manage your (Linux) Eggdrop bot with these tools
Suite of utilities to make running Anope IRC services on Linux easier
A Gtk3 Discord client in Golang
Internet Discussion Boards is a message board system by Game Maker 2k.
Chatbot platform for various instant messenger
A framework agnostic PHP library to build chat bots
A Discord client mimicking the Pesterchum chat client from Homestuck