Enjoy the following programs:
For Mac OS X. Shareware (try first, pay later).
Finds files by name, date, size etc. The perfect companion to Spotlight.
See the Find Any File page for more information and download.
For Mac OS X. Free.
Edit preferences of any application. Like the 'defaults' command in Terminal.app, but easier to use.
See the Prefs Editor page for more information and download.
For Mac OS X, Windows, Linux. Free.
The internet-enabled Block Oriented Editor is a tool to view and edit disk sectors and related files.
See the iBored page for more information and download.