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Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
GPL-2.0
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+1
BuddyPress
Powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features like user profiles, activity streams, user groups, and more.
GPL-2.0
PHP
Chitchatter
Peer-to-peer chat app that is serverless, decentralized, and ephemeral.
GPL-2.0
Nodejs
Convos
Always online web IRC client.
Artistic-2.0
Perl
+1
DavMail
POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.
GPL-2.0
Java
Discourse
Advanced forum / community solution based on Ruby and JS.
GPL-2.0
Docker