Mamesaver

Mamesaver is a tool that lets users configure MAME ROMs as screensavers on any computer, making it so you can play classic arcade games whenever the screensaver pops up on your PC.

To use Mamesaver you simply need to have any Multiple Arcade Machine Emulator installed on your computer as well as some compatible ROMs that you've run at least once. Once you have everything ready just choose Mamesaver as your new screensaver and pick the list of games you want to run when the program starts.

If you can't make up your mind which game you want to play when the screensaver pops up, Mamesaver offers an option to set any game that's running automatically to switch after the amount of time you set – from a minimum of two minutes up to a maximum of 24 hours.