BigBlueButton
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.
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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.
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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.
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Anonymously share files, browse and publish _freesites_ (web sites accessible only through Hyphanet) and chat on forums.
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WebRTC compatible Selective Forwarding Unit (SFU) that allows for multiuser video communication.
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