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+#Designing a realtime audio/video conferencing service
+
+## Features
+
+Functionality to consider when considering tool/platform.
+
+  * topology
+    + mesh (P2P)
+      all processing at end-points, participants limited by bandwidth
+    + routing (SFU)
+      light server processing, participants limited by bandwidth
+    + mixing (MCU)
+      heavy server processing
+  * stream source efficiency
+    + Support [simulcast](https://webrtcglossary.com/simulcast/)
+      i.e. encode multiple streams that an SFU can "hop" between
+    + Support spatial/temporal/quality [SVC](https://webrtcglossary.com/svc/)
+      i.e. encode a stream that an SFU can efficiently "slice" without recoding
+    + Support suspending simulcast streams
+      <https://webrtchacks.com/suspending-simulcast-streams/>
+    + Support [SCReAM](https://github.com/EricssonResearch/scream)
+  * security
+    + Support [PERC](https://webrtcglossary.com/perc/)
+    + Support [ZRTP](https://en.wikipedia.org/wiki/ZRTP)
+  * stream forwarding efficiency
+  * meeting management
+    + Personalized Meeting rooms
+    + Scheduled/Meet-me Meetings
+    + Instant/Direct Meetings
+    + Presence Support
+    + Recording
+    + Text chat
+    + Screen sharing
+  * conference stream efficiency
+    + Skip video streams beyond a threshold of participants
+    + Skip video streams tied to quiet audio streams
+    + Skip streams of explicitly tagged non-speaker participants
+  * conference management
+    + Conference Recording
+    + force-mute participants
+    + "Raise a hand" for muted participants
+  * meeting room
+    + Dual stream for dual screen
+  * Dial in from telephone
+  * Dial in from SIP audio-only
+  * Dial in from SIP with video
+  * Dial in from SIP with SIMPLE text chat
+
+## See also
+
+### Tools
+
+[Janus Gateway](https://janus.conf.meetecho.com/)
+WebRTC SFU/bridge/broker
+written in C
+
+[Mediasoup](https://mediasoup.org/)
+WebRTC SFU
+written in C
+
+[Kurento](https://www.kurento.org/)
+WebRTC MCU
+written in C++
+
+[drachtio](https://drachtio.org/)
+SIP "SFU"
+written in C++
+
+[Licode](https://lynckia.com/licode/)
+WebRTC MCU
+written in C++
+
+[Medooze WebRTC Media Server](https://github.com/medooze/media-server)
+WebRTC/SIP MCU
+written in C++
+
+[SylkServer](https://sylkserver.com/)
+SIP "SFU"
+written in Python
+
+[Spreed WebRTC](https://github.com/strukturag/spreed-webrtc)
+WebRTC SFU
+written in NodeJS and Go
+
+[Jitsi Videobridge](https://jitsi.org/jitsi-videobridge/)
+XMPP SFU
+written in Java
+
+[Jigasi](https://jitsi.org/jitsi-meet/)
+WebRTC bridge to Jitsi Videobridge
+written in Java
+
+### Platforms
+
+[multiparty-meeting](https://github.com/havfo/multiparty-meeting)
+using Mediasoup
+(and optionally drachtio and Kurento)
+written in JavaScript
+hosted at <https://letsmeet.no/>
+
+[Jangouts](https://github.com/jangouts/jangouts)
+using Janus
+written in CoffeeScript
+
+[tawk.space](https://github.com/invisible-college/tawk.space)
+using Janus
+written in CoffeeScript
+hosted at <https://tawk.space/>
+
+[SIP2SIP](https://ag-projects.com/sip2sip/)
+using SylkServer and Janus
+hosted at <https://sip2sip.info/>
+and <https://webrtc.sipthor.net/>
+
+[Roll Call](https://github.com/mikeal/roll-call)
+audio-only
+hosted at <https://roll.call>
+
+[Spreed.ME](https://www.spreed.me/)
+using Spreed WebRTC
+
+[Nextcloud Talk](https://nextcloud.com/talk/)
+using Spreed WebRTC
+
+[Jitsi Meet](https://jitsi.org/jitsi-meet/)
+using Jigasi and Jitsi Videobridge
+hosted at <https://meet.jit.si/>
+
+[Matrix](https://matrix.org/)
+using Jigasi and Jitsi Videobridge
+
+[BigBlueButton](https://bigbluebutton.org/)
+using Kurento
+written in Java
+
+[mConf](http://mconf.org/)
+using Kurento
+written in Java and Ruby
+
+[OpenMeeting](https://openmeetings.apache.org/)
+written in Java
+
+[Wire](https://wire.com/)
+proprietary-protocol [Free Software](https://github.com/wireapp/wire) stack
+written in Haskell, Rust, C
+
+[Talky](https://about.talky.io/)
+cloud SFU service
+hosted at <https://talky.io/>
+
+[Me](https://join.me/)
+cloud SFU service
+
+GoToMeeting
+cloud SFU service
+
+[Zoom Meetings](https://zoom.us/)
+cloud SFU service
+supporting "up to 50 participants at once"
+(but client bandwidth and resource demands and stability of such session is unknown)
+
+Hangouts Meet
+cloud SFU service
+
+Webex Meetings
+cloud SFU service
+
+Skype
+cloud SFU service
+suporting "up to 25 participants at once"
+(but client bandwidth and resource demands and stability of such session is unknown)
+
+MoxieMeet
+cloud SFU service
+requiring Google account
+supporting "up to 32 users all on video together"
+(but client bandwidth and resource demands and stability of such session is unknown)
+
+TeamViewer
+cloud SFU service