It doesn’t do much, only scans the registry for installed Delphi versions (Starting with Delphi 5, I am not sure about the registry path’s for the older versions. Feel free to send me patches.) and gives you a list of all entries in the Libraries branch. In addition to a list by Delphi version it also gives you a list by entry for all Delphi versions as you can see in the screen shot. That way you can easily compare the same path in different Delphi installations.
It’s on SourceForge.