FreeMem

FreeMem is a handy tool that can increase your free memory with a simple click.
It always monitors your memory usage in your menubar.
Free system memory for better application performance.
A quick and easy alternative to either a reboot or RAM upgrade to get defragmented free memory.

If you are in the middle of using an application and the system becomes unresponsive for several seconds it could be the memory manager organising free memory for your application to use.

FreeMem clears Inactive memory to help your applications avoid the performance hit you get when running low on Free memory.