Hey there,
I’m currently maintaining the bookmarks app and am looking for people that would like to get their hands a bit dirty with code. Specifically, if you have time to review code changes once a week, that would already go a long way. If you’d like to work on some features yourself, even better. I’m also happy to help answer questions about the code base and work on new features together.
Drop me a message via PM or via mail if you’re interested 
Cheers
Marcel