Prevent your Mac from going to sleep when you really need it.
Have you ever run into the issue where your computer goes to sleep while downloading a large file or performing a backup? CaffeinateMe can help by keeping your system running and "awake" either for a specific time period or indefinitely until you cancel. If a timer is used the app will show the remaining time in the dock and will also use Mac OS's notification center to announce when it's "done". Starting with version 1.3, you can now also caffeinate individual apps.