EmuNations

RomVault is a GUI-based rom management tool and can be seen as an alternative to Clrmame Pro with additional features at managing large numbers of DAT and/or Roms in a more streamlined process.

Steam Rom Manager is a bulk game importer and artwork manager for Steam. It's basically an app for managing ROMs and benefiting from what Steam has to provide. This includes using big picture mode, its overlay, controller management layout, streaming...

Pantheon is a closed-source, multi-system emulator for Windows covering many old computers and home consoles such as Acorn, Atari, ColecoVision, Jupiter ACE, Commodore, Magnavox, Mattel, MSX computers...