Jolt is a useful Mac OS X app that solves a basic problem. If you’ve ever wanted your MacBook, MacBook Pro, or MacBook Air display to stay on full power for just a few minutes, Jolt is for you.
Simply click the Jolt icon and your system will stay on for a few minutes. After the time you’ve specified is over your Mac returns to normal operation so that your battery doesn’t drain and you don’t have to fiddle with energy settings.
Easily watch YouTube videos without moving your mouse every minute, deliver presentations without a blank screen showing up, or take your time reading a page without having to touch your Mac.
Jolt comes in two versions, the freeware Jolt Lite, and the full version of Jolt (US$5, 50% donated to charity) which lets users create up to five durations ranging from 3 minutes to forever. Users can also assign different icon colors to tell each of them apart.
More info and download link here.