SpeedIt is a OS X Kernel extension and Preference Panel application designed for real-time CPU frequency, throttling and monitoring and on-the-fly adjustment of the CPU performance level on Intel Core Duo models via processor's power management model-specific registers (MSRs).
SpeedIt continuously monitors the CPU usage level and dynamically adjusts the CPU frequency, throttle and/or voltage level as needed and/or defined.
XYPHER Avoid, has bad code. Will cause low level damage. Not compatible with recent builds of OSX Tiger. Disabled my Audio so I had to do an archive and backup reinstall on my MBP to fix it. Not surprising that development has stopped on this dangerous program. (Version 0.5)
TOURIST It does a lot more but the prefpanel doesn't seem to be included so you have to use the command line. I'm guessing that this isn't submitted by the developer because it's not ready yet. (Version 0.5)
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Sep 25 2006
MARC EDWARDS It can also be used to add functionality to the iStat suite of widgets and applications.