Windows only: Screen Marker is a simple, tiny utility that lets you freehand draw on the current screen. Say, for instance, you're remote-controlling Mom's PC or doing a presentation and you want to circle an area of the screen - Screen Marker's for you.
Unlocker is an explorer extension that allows you with a simple right-click of the mouse on a file or folder to get rid of error message such as error deleting file or folder, cannot delete folder: it is used by another person or program. Unlocker can unlock files, folders, dll, and can also delete index.dat without restarting your computer.
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R. d. A. Ricardo, G. Guizzardi, and K. Duarte. International Conference on Software Engineering and Knowledge Engineering, SEKE?02, Ischia, Italy, (2002)