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Jiggler is a little freeware app with one purpose: to keep your Mac awake. When you have some lengthy task for your computer to do, it's annoying to have to turn off your screensaver and turn off the sleep timer, only to have to turn it all back on again when you're done. (The "never sleep" corner will keep your screensaver from kicking in, but still won't prevent your machine from falling asleep.) What you really want is a little helper who will bump your mouse every once in a while to keep your machine alert. That's Jiggler.
Jiggler just wiggles your mouse every once in a while, keeping your machine awake and happy. When you want to stay awake, run it. When you don't want to, quit it. You can even run it while you're working, because you can set it not to wiggle your mouse unless your computer has been sitting idle for a while. Or you can configure it to:
* jiggle only when your machine is busy working, to make sure it doesn't fall asleep in the middle of a long job
* jiggle whenever an unburned CD or DVD is inserted, to make sure it doesn't fall asleep while burning
* jiggle whenever iTunes is playing, so your music doesn't get interrupted
* jiggle whenever a particular application is running, if there's an app your machine needs to stay awake for!