alternative to dead simple screen sharing

[http://dummy.us.eu.org/robert (Robert)]

My comrades were talking about using jitsi for meetings.  I hadn't heard
of it.  It seems better than dead simple screen sharing because there
isn't a hard limit of 4 users.

You should add it to the #board-meetings Slack channel:

 https://slack.com/oauth/authorize?client_id=116888949298.122751011265&scope=bot,commands