Browse free open source Communications software and projects 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
Ham Radio Digital Modem Application
A universal P2P file sharing client for Windows
You can message and share files inside your intranet without a server.
Document Management System and Content Management System
A universal instant messaging (IM) program
An intranet chat application that does not require a server.
The portable software collection
A free course management system (CMS) to create online learning sites
Search, Download, Play, Share on Bittorrent and the cloud
Unified Communications Server
Psi+ Project — development branch of Psi XMPP client
Play music online. With friends. For free.
Powerful Open Source Email Marketing app with analytics & segmentation
A free peer-to-peer (P2P) BitTorrent file sharing client
Open Source Document Management System
Real time satellite tracking and orbit prediction
Low-latency, high quality voice chat for gamers