TweakNow PowerPack 2005 Professional 

TweakNow PowerPack is a fully-integrated suite of utilities that let you fine-tune every aspect of your computer's operating system and Web browser. The RAM Idle program manages the free memory that is available to run Windows programs.
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TweakRAM 

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.
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