@misterti @mauriziocarnago @scuola @maupao @rresoli @opavlos

About #videoconference, @moodlenet integrate well #BlueBigButton and @jitsinews

And about mail, you can get free/cheap mail at @Tutanota, @mailbox_org, @protonmail, @riseup, etc. and even manage it using @yunohost , #ispconfig, etc.

@nextcloud is also a must.