c3 short link overview
Essential
Phonebook and extension registraion (DECT, SIP, GSM ) by Eventphone/POC
Congress checklist by MacLemon and others
Alternatives: /checklist
For the interested creatures
Assemblies signup
Alternatives: /assemblies, /ass
Create and fix subtitles and translations for talk recordings
#subtitles
Alternatives: /sub, /subtitles
Chat statistics of congress related IRC channels
Alternatives: /irc/stats
For most angles
Rocket chat where a lot of the coordination happens
#communication
Eneglsystem (angel shift coordination)