OpenedFilesView is especially useful if you try to delete/move/open a file and you get Sharing Violations.

A post about advantages of defragmenting of files, 5 free tools that are good at defraging files on Windows.

Code Profilers are very distinct from traditional debuggers. They are able to catch the trivial and non fatal coding errors which are often hard for humans to catch. These trivial bugs later claim weeks of debugging and extra cost to fix