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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.
LGPL-3.0
Java
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
Hyphanet
Anonymously share files, browse and publish _freesites_ (web sites accessible only through Hyphanet) and chat on forums.
GPL-2.0
Java
Jitsi Video Bridge
WebRTC compatible Selective Forwarding Unit (SFU) that allows for multiuser video communication.
Apache-2.0
Java
+1
Mail-in-a-Box
Turns any Ubuntu server into a fully functional mail server with one command.
CC0-1.0
Shell
Openfire
Real time collaboration (RTC) server.
Apache-2.0
Java