Back in 2014, a virtual reality arcade demo arrived and seriously excited people. Since then, developer Digital Cybercherries have put together an updated version with all manner of new features and bug fixes with New Retro Arcade: Neon.
That demo is now available on Steam. Although this version itself does not include any actual ROMs, it is not hard to look around online and figure out how to add that stuff in if you need it.
New Retro Arcade: Neon’s demo is free while the upcoming full release will include features like a cinema, six player multiplayer, and more. The game runs with both Oculus Rift and HTC Vive.