Yith Library is a FOSS online password manager.
Ranked in these QuestionsQuestion Ranking
Pro Allows setting up own server
Yith Library's server code is available on Github along with instruction on how to set it up. It requires enough knowledge to set up and run a server in a virtual Python environment.
Pro Passwords are encrypted client-side
Yith Library uses client side JS encryption to ensure that passwords never travel in clear text.
Pro Free and open source
Con Poor user experience
Yith Library is confusing. It's hard to navigate, it ask for permissions without explaining why or how those permissions will be used, none of the UI elements are explained and the language is iffy at best.