Description of App:
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. Right-click (or ⌘-click) the icon to show the menu.
Important: Caffeine lives in the MENU BAR, and this is where its state is indicated. App Store puts the Caffeine icon in the dock, but you can just remove it if you want to.
Free or Paid:
Version Of OS X App Was Tested On:
This app works as advertised near as I can tell, but you don't get any indication whether the coffee cup is full or not. So you have to remember if you pressed the button. I've contacted the developer about this issue, but haven't heard back yet. the app was last updated in 2010. All the preferences screens and menulet options work, however.
I find this most useful when listening to music, audio described movies, or a processor-intensive task.