Browse free open source Chat software and projects for Windows below. Use the toggles on the left to filter open source Chat software by OS, license, language, programming language, and project status.
You can message and share files inside your intranet without a server.
A Windows client for the Direct Connect networks
A universal instant messaging (IM) program
Psi IM — Qt-based XMPP client
Psi+ Project — development branch of Psi XMPP client
A free peer-to-peer (P2P) BitTorrent file sharing client
The Leading Open Source Communication Hub | Community Version
Standalone chat system developed in php, mysql and javascript
Fully customizable web chat created using AJAX.
The IRC's Talking Robot