Reporters that use macOS specific binaries, i.e. not cross platform programs.
If you are looking for something cross platform like gvim, emacs, you better look in com.nikolavp.approval.reporters.Reporters.
A reporter that calls diffmerge to show you the results.
A reporter that calls ksdiff to show you the results.
A reporter that calls p4merge to show you the results.
A reporter that calls tkdiff to show you the results.