HiddenMe - Hide desktop icons with a single click.
CleanMyMac X - Clean, protect and speed up your Mac
Likewise - Get recommendations you love, from people you know.
Fossils - Find and clean out all your old unused files
Alternative Hunt - Learn about great alternative products as you browse the web
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.