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
You can message and share files inside your intranet without a server.
An extremely powerful and configurable BitTorrent client
Ham Radio Digital Modem Application
A Windows client for the Direct Connect networks
A universal P2P file sharing client for Windows
A fast cross-platform FTP client
A universal instant messaging (IM) program
Document Management System and Content Management System
Open Source Enterprise Content Management ECM
The portable software collection
Qt based GUI tool designed to create and edit .torrent files
A free course management system (CMS) to create online learning sites
Psi IM — Qt-based XMPP client
An intranet chat application that does not require a server.
Psi+ Project — development branch of Psi XMPP client
Unified Communications Server
Real time satellite tracking and orbit prediction
Open Source Document Management System
A free peer-to-peer (P2P) BitTorrent file sharing client