Caffeine for Mac

Caffeine is a tiny program that puts an icon in the right side of your menu bar. Click it to prevent your Mac from automatically going to sleep, dimming the screen or starting screen savers. Click it again to go back.

Free Mac OS X

Amphetamine

Amphetamine is a little app that lives in your menu bar which can effortlessly override your energy saver settings and keep your Mac awake.

Free Mac OS X

dont sleep

Don't Sleep is a small portable program to prevent system shutdown, Standby, Hibernate, Turn Off and Restart.

Free Windows

NoDoze

NoDoze simulates keyboard/mouse activity to keep the screensaver from activating. Its activity depends on currently running programs. You can use regular expressions or...

Free Open Source Windows

Sleep No More

A tiny menu bar application, that prevents your Mac from sleeping for a set amount of time.

Free Mac OS X