RamSmash 1.2.26.2007 
875 KB, shareware, rate:  
RamSmash - optimizes computer memory by freeing wasted memory back to the computer. Works in the background to free memory to reasonable values to maintain system stability
more info screenshot

TweakRAM 5.8.10.13 
2.34 MB, shareware, rate:  
TweakRAM is a handy memory optimizer tool that will keep your computer running faster and efficiently.It increases your system performance by making more memory available for your applications and the operating system
more info screenshot

TweakVI Basic Edition 1.0 build 1045 
11.14 MB, freeware, rate:  
The first software designed to both tweak and optimize Windows Vista. Tweak hundreds of hidden features of Windows Vista, optimize your machine and customize it to your needs
more info

RAM Booster Pro 5.0 
380 KB, shareware, rate:  
RAM Booster Pro uses an advance technology which stops the memory leak and boosts up your system's RAM up to 60-70% more
more info screenshot

FreeRAM XP Pro 1.52 
606 KB, freeware, rate:  
FreeRAM XP Pro is a freeware program designed to defragment and free up your system`s RAM (Random Access Memory)
more info screenshot

RamCleaner 4.1 
676 KB, shareware, rate:  
RamCleaner makes it easier than ever before to free up unused RAM, prevent crashes and increase performance
more info screenshot

ClockGen 1.0.5.0 
322 KB, freeware, rate:  
ClockGen is an program dedicated to overclocking. Its main purpose is to change the system clocks on the fly : FSB (Front Side Bus) and GSB (Graphic Side Bus). ClockGen also provides some functions that allow you to improve and monitor your overclock
more info screenshot

SC Net Speed Booster 4.0.0.1 
4.36 MB, freeware, rate:  
Net Speed Booster is a utility to help you keep your system healthy and responsive
more info screenshot

Tweak-XP Pro 4.0.8 
6.08 MB, shareware, rate:  
Tweak-XP Pro bundles over 56 different utilities in one. Tweak-XP Pro was developed to combine both optimizing and tweaking features to increase the speed of your system
more info screenshot