Joplin is more directly comparable. The apps are open source and it offers sync with all kinds of targets. It monetises through a source available sync server (i.e you can run your own but you arent allowed to run it commercially) hosted by Joplin (Joplin Cloud)

For transparency im directly involved with Joplin as a volunteer (less so in recent months admittedly) so yeah, im a bit biased.

That would be Forgejo. Codeberg is the hosting service which already existed running Gitea before it forked it and started developing it as Forgjo and moving to it from Gitea.

I was a bit surprised to see Kath in a meme so came straight to the comments…

Heliboard which is an active fork of OpenBoard.

I have a whole bunch of these:

• DevTerm
• uConsole
• GameShell
• BeepBerry
• PocketCHIP
• PICOmputer 28

Non-Linux:

• Hand386
• Book 8088
• Forth Deck
• T-Deck

I’m looking at getting a couple more as well. Honestly I don’t have much use for any of them but my favourite and the one I have used practically the most is my DevTerm. I love the style, the screen, its just a really fun little device.