Need recommendations for a good one that won’t be a pig, because the server is also running git and mailing lists
Issue tracker, or Bug Tracker? Because is you need it to be the latter, MantisBT is one of the better free alternatives. For a general issue tracker? Still MantisBT if you modify a few things yourself.
Personally I wrote my own awhile back that is basically just a front-end to a git repo. Don’t ask why