Supports real-time sharing of audio, video, slides (with whiteboard controls), chat, and the screen. Instructors can engage remote students with polling, emojis, and breakout rooms.

LGPL-3.0

Java

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

Cypht

Feed reader for your email accounts.

LGPL-2.1

PHP

Dovel

SMTP server that sends and receives emails according to a simple configuration file, with an optional web interface that you can use to browse your emails.

LGPL-3.0

Elgg

Powerful open source social networking engine.

GPL-2.0

PHP