Memory Free is a very useful tool. It can monitor memory usage,
finishing more memory space for you. This tool
can run with mac os 10.5 or above
Good features:
1. One key clean-up memory. When you need more memory, you can click "clean up" button.
2 Set to automatically clean up.
3 optimization, compact, little memory usage.
4,Shows memory usage pie chart in the status bar. Very easy to keep track of memory status.
5,Well design, good look.

Note, mac osx is a very advanced operating system, it can manage memory very well,
this tool can get more memory you need in a timely manner for cleaning up memory.