Floating Clock 

Floating Clock PS is a freeware clock, calendar program designed to run on the top of your desktop. There are ten settings you can choose to run, from Long Date to Long Time and all the settings in between. This is a no-thrills, no-frills program,
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SemTop! 

SemTop! is a nifty tool that allows to keep important windows always on top of the desktop and doesn't allow other windows to overlap it.
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