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Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
GPL-2.0
C
+1
Converse.js
XMPP chat client in your browser.
MPL-2.0
Javascript
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
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
+2
DragonFly
A small MTA for home and office use. Works on Linux and FreeBSD.
BSD-3-Clause
C