Cut through the crap, when it comes to Mac OS X apps! I've spent time talking to friends, and testing out applications. These are my favorites. I don't post everything; on the contrary, I put up only the best of breed. You won't find any junk here, other than maybe my design.
Suggest a KILLER app.

System

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AppZapper
Blow away installed applications on your system with ease. This application is smart enough to know where most applications litter files throughout the system, and removes them during uninstallation.
 
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Disk Inventory X
As you add new clutter to your OS X system over time by adding new applications, and downloading files, you begin to run out of hard disk space. Disk Inventory X helps you quickly identify what is using the bulk of it.
 
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DragThing
Augment your dock with an additional one! Except this sucker can be dragged anywhere on your screen, and do much more.
 
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TinkerTool
An excellent utility to unlock and change hidden system preferences that the System Preferences tool seems to overlook!