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

Dovecot

IMAP and POP3 server written primarily with security in mind.

MIT

LGPL-2.1

Elgg

Powerful open source social networking engine.

GPL-2.0

PHP

Eqivo

Eqivo implements an API layer on top of FreeSWITCH facilitating integration between web applications and voice/video-enabled endpoints such as traditional phone lines (PSTN), VoIP phones, webRTC clients etc.

MIT

Docker

Flarum

Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.

MIT

PHP