HELMERS  The application works with a fairly basic concept: Force the system to load a large chunk of mumbo-jumbo, then release it.

I tried this in a "perfect scenario". My MacBook had spent the night copying files, and all the normally "free" memory was marked as "inactive". After pressing the optimize button I got it all back.

As some say, this is not very difficult to do, and normally OSX does a great job of managing memory. It is also not a substitute for having sufficient memory, as iFreeMem does not magically create memory, it simply forces the system to empty all its buffers.  
(Version 3.0)