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Exim
Message transfer agent (MTA) developed at the University of Cambridge.
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Open source
Self-hostable
GPL-3.0
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Courier MTA
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
GPL-3.0
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Weechat
Fast, light and extensible chat client.
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Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
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Dovecot
IMAP and POP3 server written primarily with security in mind.
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Software framework for decentralized, peer-to-peer networking.
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Janus
General-purpose, lightweight, minimalist WebRTC Server.
GPL-3.0
C