Telegram Desktop messaging app
An open-source cross-platform alternative to AirDrop
Feature rich WhatsApp Client for Desktop Linux
A free and reliable P2P BitTorrent client
Amateur Radio AX.25 chat and PBBS program using Linux's AX.25 stack
You can message and share files inside your intranet without a server.
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Development toolkit for Web Services and XML data bindings for C & C++
Your own private chat server. No coding. Ready in minutes.
Privacy focused messenger that doesn't trust anyone with your identity
Peer-to-peer, decentralized and open-source file sync
Plain-text file notepad with markdown support and ownCloud integration
Network file transfer application for Windows, OS X, & Linux
Network steganography / covert channels evaluation tool
A project for open source time travel with computers.
[WARNING] Project has moved to http://github.com/Retroshare/Retroshare
Encrypting E-Mail Client
Remote control your linux console encrypted trough Jabber chat service
p2p (sockets) chat with inKey encryption (32768 bit).
Extendable on-screen keyboard.
An IRC proxy to add chat encryption to IRC clients
A GTalk client for Linux using Qt4 and libgloox.
An intranet chat application that does not require a server.