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Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
GPL-2.0
C
+1Courier MTA
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
GPL-3.0
C
+1
Cyrus IMAP
Email (IMAP/POP3), contacts and calendar server.
BSD-3-Clause-Attribution
C
Dovecot
IMAP and POP3 server written primarily with security in mind.
MIT
LGPL-2.1
+2Exim
Message transfer agent (MTA) developed at the University of Cambridge.
GPL-3.0
C
+1
Flexisip
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.
AGPL-3.0
C
+1