Mozilla's bug tracking system has a "good first bug" tag: https://bugzilla.mozilla.org/buglist.cgi?quicksearch=sw:[good%20first%20bug] https://bugzilla.mozilla

Mozilla's bug tracking system has a "good first bug" tag: https://bugzilla.mozilla.org/buglist.cgi?quicksearch=sw:[good%20first%20bug] https://bugzilla.mozilla.org/buglist.cgi?quicksearch=sw:[goo... Other projects, such as GHC (the Haskell compiler), have a "difficulty" field in their bug tracking system.