In case you missed it, there are now several #RetroComputing Mastodon apps available:
Apple II
https://www.colino.net/wordpress/en/binary-release-of-mastodon-for-the-apple-c/
Apple Macintosh OS (pre-OSX)
https://github.com/smallsco/macstodon
Commodore Amiga
https://github.com/BlitterStudio/amidon
IBM MVS
https://github.com/mainframed/BREXXTODON
MS-DOS
https://github.com/SuperIlu/DOStodon
Windows 95
https://github.com/meyskens/mastodon-for-workgroups
@feditips command linux client?
There's a command line client called Toot:
It also works as a TUI client.
(By the way, it has no connection to the smartphone apps Toot! or Tooot, they're just similar names)