Free Ram Optimizer XP is a free and useful tool that optimizes your memory (ram). Avoid application crashes due to low memory. This program monitors your memory, and frees up ram if it falls below a certain minimum. It consumes little memory (the lowest when compared to other such programs available on the net). You can configure it to free memory automatically or manually.
Note: WinXP has a very state-of-the-art memory management, and you won't notice any performance improvement when using memory optimizers. All such optimizers/boosters available on the market - both freeware and trialware - are useless for XP and others to follow. Such programs are recommended for 95/98/ME only.