An alternative Discord client with voice support made with C++ and GTK
A New Kind of Instant Messaging
Mumble is an open-source, low-latency, high quality voice chat
The game engine for everyone
Feature rich WhatsApp Client for Desktop Linux
The extensible chat client
A reference implementation of the SimpleX Messaging Protocol
A Discord Bot to protect your server from spam, invitations
Distributed messaging and streaming platform with low latency
Miranda NG: Next Generation of Miranda IM
Chat client for Twitch
A universal instant messaging (IM) program
You can message and share files inside your intranet without a server.
A Windows client for the Direct Connect networks
Psi+ Project — development branch of Psi XMPP client
Development toolkit for Web Services and XML data bindings for C & C++
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Anope hybrid services for use on the Karma-Irc network.
rabbit instant messaging
BOT IRC in Perl