GoogleDocs cloud.uni-weimar.de Nextcloud based solution provided by TU-Berlin
Skype/zoom https://meeting.uni-weimar.de BigBlueButton
https://www.conf.dfn.de/ Pexip provided by DFN
https://edumeet.geant.org/ Jitsi provided by GÉANT
doodle/appoint.ly https://terminplaner.dfn.de/ Meeting time scheduler by DFN