Bovine is an ActivityPub server available at https://codeberg.org/helge/bovine/. I run a version at https://mymath.rocks/. This is basically, so you can support this effort. The funding goal should cover sever operations for a year.
I will tell donors how accounts can be created on the server and enable them. Access to the web account management requires signing up with https://hello.coop There won't be any passwords involved on my side.
There exists also a Python client library for it: https://bovine.readthedocs.io/en/latest/index.html and https://pypi.org/project/bovine/