CoolMon
This is a small system monitoring application that displays current system data and performance statistics on your desktop.
MemDefrag 2
This program defragments RAM in real time making more RAM available for other processes.
O&O CleverCache Professional Edition
Optimize your file cache management in Windows XP, Windows 2000 and Windows NT with O&O CleverCache V6.0 Professional.
Win9x/ME Task Manager
This lets you know the CPU information, memory usage, processes, and applications running on your computer.
Alto Memory Booster
This has a basic or advanced mode that will help reclaim wasted memory on your Windows computer.