I mainly use linkstack https://linkstack.org/, git repo: https://github.com/LinkStackOrg/LinkStack
Theres an instance for the programming.dev instance if you want an example of how it looks https://me.programming.dev (weve got a space-like theme on it)
It works, those statuses are just a bit misleading
How it works is it subs to a community (from all instances connected to it) until someone from an instance subs and then it unsubs in that instance. In the previous version of the site when it unsubbed it would mark the instance it unsubbed from as completed on that community (although seems to be a bit broken here)