Mac, awake

Marcel Dierkes’s KeepingYouAwake is a free Mac app, a successor to the worthy Caffeine (which hasn’t been updated for quite some time). KeepingYouAwake keeps the Mac from going to sleep. Useful when downloading a large update or when you’re using the computer intermittently and don’t want to be typing in a password again and again.

A more elaborate free no-sleep app: Amphetamine. As a resident of downstate Illinois, I wish that one had a different name.