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
Anti-Spam SMTP Proxy Server implements multiple spam filters
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.
Simply explore your Android phone!
Document Management System and Content Management System
A Windows client for the Direct Connect networks
A universal instant messaging (IM) program
The portable software collection
Psi IM — Qt-based XMPP client
Psi+ Project — development branch of Psi XMPP client
Unified Communications Server
A free peer-to-peer (P2P) BitTorrent file sharing client
Powerful Open Source Email Marketing app with analytics & segmentation
Open Source Document Management System
A multi-protocol & multi-source, cross platform download utility
Open Source Enterprise Content Management ECM
Qt based GUI tool designed to create and edit .torrent files
A GTK+ Gnutella client, optimized for speed and scalability