As a few people have pointed out, Kavita is a solid one. I ultimately used it because it saves your spot in the book server-side instead of with the browser (like calibre-web) so you can pick up where you left off on different devices.
Also has a pretty good PWA for your phone if you want to read on there.
Because federation is broken between many servers, I have to use multiple accounts to see all the communities.
I’m doing my part!