[Trisquel-users] Recommended gaming emulators

[freeworld4]

What free software emulators do you recommend? I am able to do 3d  
acceleration on my computer so 3d games I can play also.
To me I think the games are like an mp3 file vs ogg file it maybe a  
proprietary format but you can play it with free software. What are your  
views on rom games and free software?