Courier MTA

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

Communication GPL-3.0 C deb

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Exim

Message transfer agent (MTA) developed at the University of Cambridge.

Communication GPL-3.0 C deb

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Weechat

Fast, light and extensible chat client.

Communication GPL-3.0 C Docker deb

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Asterisk

Easy to use but advanced IP PBX system, VoIP gateway and conference server.

Communication GPL-2.0 C deb

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Dovecot

IMAP and POP3 server written primarily with security in mind.

Communication MIT LGPL-2.1 C deb

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GNUnet

Software framework for decentralized, peer-to-peer networking.

Communication GPL-3.0 C

6/5/2026 Details →

Janus

General-purpose, lightweight, minimalist WebRTC Server.

Communication GPL-3.0 C

6/5/2026 Details →