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
An easy-to-use anti-spam email gateway
Anti-Spam SMTP Proxy Server implements multiple spam filters
A free peer-to-peer (P2P) file sharing client
Weak signal ham radio communication
An extremely powerful and configurable BitTorrent client
Serial and TCP terminal for engineering and debugging
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
32/64 bit multi-platform Ethernet S7 PLC communication suite
An intranet chat application that does not require a server.
SMTP email proxy and relay server
The portable software collection
Yet Another Terminal :: Serial Communication :: Engineer/Test/Debug
A free course management system (CMS) to create online learning sites