CleanMem - CleanMem keeps memory use in check on the system without the memory being pushed to the page file.
Memory Cleaner X - Memory Cleaner X cleans inactive RAM from your computer that allows you to have more applications...
RAMRush - RAMRush is a free memory management and optimization tool.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Mz Ram Booster - Mz Ram Booster, is a memory optimization tool. It works on Windows 2000,XP,2003 & Vista.
Advanced Task Killer - This tool is also known as ATK. It is a tool to kill applications running.