fosstodon.org is one of the many independent Mastodon servers you can use to participate in the fediverse.
Fosstodon is an invite only Mastodon instance that is open to those who are interested in technology; particularly free & open source software.
If you wish to join, contact us for an invite.
Many thanks to @CoralineAda and @stumpsyn we now have a Code of Conduct for both the GetTogether software project, and an Events CoC for the https://gettogether.community instance.