Turbo Boost Switcher Free

Turbo Boost Switcher

Enable / Disable Turbo Boost feature on demand.
Monitors both CPU Load, Temperature, Fans and Battery.
Configure open at Login.
Enable / Disable at launch

Turbo Boost Switcher Pro

Turbo Boost Switcher Pro

All free features plus...
+ Auto modes based on temperature, fan speed, battery status, apps running and more!
+ Fully customizable status bar
+ Enter root password just once
+ Auto disable Turbo Boost when not charging
+ OSX Notifications integration
+ Shows Temps on ºC and ºF
+ Free updates forever

Read more details on the app blog.