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
You can message and share files inside your intranet without a server.
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
A free course management system (CMS) to create online learning sites
Qt based GUI tool designed to create and edit .torrent files
Psi+ Project — development branch of Psi XMPP client
Psi IM — Qt-based XMPP client
An intranet chat application that does not require a server.
Manage port forwardings via UPnP
Real time satellite tracking and orbit prediction
A free peer-to-peer (P2P) BitTorrent file sharing client