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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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Apprise
Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc.
MIT
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+2
Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
GPL-2.0
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Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit).
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Rust
+3
Dovecot
IMAP and POP3 server written primarily with security in mind.
MIT
LGPL-2.1
+2