Browse free open source Communications software and projects for Mac and Linux below. Use the toggles on the left to filter open source Communications software by OS, license, language, programming language, and project status.
A free and reliable P2P BitTorrent client
Anti-Spam SMTP Proxy Server implements multiple spam filters
Weak signal ham radio communication
Issabel PBX - Unified Communications
An extremely powerful and configurable BitTorrent client
Ham Radio Digital Modem Application
Windows eml and mbox viewer.
Open source software for live streaming and recording
A cross-platform G-Code sender for GRBL, Smoothieware, etc.
The classic email sending library for PHP
A universal instant messaging (IM) program
32/64 bit multi-platform Ethernet S7 PLC communication suite
SMTP email proxy and relay server
An intranet chat application that does not require a server.
Document Management System and Content Management System
Icecast and Shoutcast broadcasting client
A free course management system (CMS) to create online learning sites
StreamFX is a plugin for OBS® Studio which adds many new effects
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