Is there a free issue tracker software that
- permits to attach a location to an issue (preferably by marking the location on a map),
- permits to filter issues by location (preferably by displaying all issues on a selected part of a map), and
- permits to flexibly define further fields describing an issue and filter issues by these fields?
Standard issue trackers like Redmine or Bugzilla appear not to provide support for tagging issues with geo locations. Furthermore, while openstreetbugs (a tool for tracking issues with the geo data of the Openstreetmap project) is centered around the idea of marking issues on a map, it does not permit to freely define the structure of an issue.