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
Open source software for live streaming and recording
The classic email sending library for PHP
Weak signal ham radio communication
Device Manager for ONVIF-based Network video devices.
An intranet chat application that does not require a server.
Windows tray utility / filesystem watcher / launcher for Syncthing
Connect to a Service Bus namespace and administer messaging entities
Serial and TCP terminal for engineering and debugging
A cross-platform G-Code sender for GRBL, Smoothieware, etc.
Ham Radio Digital Modem Application
Issabel PBX - Unified Communications
All your favorite services in one place
A universal P2P file sharing client for Windows
You can message and share files inside your intranet without a server.
A faster, leaner email client and fork of Nylas Mail
Windows eml and mbox viewer.
API Support for your favorite torrent trackers