Xbox Game Pass library browser | GamePassport
gamepassport.net
Find the next game to play with GamePassport, a convenient browser for the Xbox Game Pass library. Compare critic and user scores, filter by categories and features.

I’ve been using this site for a while now and it’s the best one I’ve found for discovering Game Pass titles. There are a lot of filters that are useful for PC gamers, so it’s not just console-focused.

I’m not affiliated with the site in any way. Just an enthusiastic user.