Browse free open source Communications software and projects for Windows below. Use the toggles on the left to filter open source Communications software by OS, license, language, programming language, and project status.
WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.
A free and reliable P2P BitTorrent client
A free peer-to-peer (P2P) file sharing client
An extremely powerful and configurable BitTorrent client
A universal P2P file sharing client for Windows
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
Document Management System and Content Management System
The portable software collection
Psi+ Project — development branch of Psi XMPP client
Powerful Open Source Email Marketing app with analytics & segmentation
The pinnacle of file-sharing and chat - an innovative DC client!
A GTK+ Gnutella client, optimized for speed and scalability
Qt based GUI tool designed to create and edit .torrent files
forma.lms is a Learning Management System (LMS), opensource lms
Program for filesharing using Direct Connect and ADC protocols
Cross-platform player and audio manager
Standalone chat system developed in php, mysql and javascript
A fast cross-platform FTP client
Simple, web-based address & phone book