The main project hasn't received a meaningful update since 2022. 

One of the more active forks however is Helium314's:
https://github.com/Helium314/openboard

There are some changes from the main openboard project listed on the main page.  

 Thank you, very promising, on a first glance. 

They say this is still a beta, and do fdroid release yet. I guess I'll wait a bit more.