dzDeleteProp is a small tool I just wrote, that deletes configurable properties from all Delphi .dfm files in a given directory and optionally its subdirectories.
The reason for such a tool is backwards compatibility to older Delphi versions, e.g. Delphi 6 does not know about ExplicitWidth and ExplicitHeight, which Delphi 2007 and above insist on putting into the .dfm files no matter what.
The tool is loosely based on a similar tool written by Andrei Kireev which is available from Embarcadero CodeCentral.
You can download it from SourceForge or get the source code from there as well.