I recently obtained a Super Everdrive and have been exploring its uses. Since I already owned many of the standard games in cart form, its main use is to play hacks and translations of Japanese-only releases. Along with hacks and translations, you also have re-translations of released games and pirate games.
It is nice to scroll through romhacking.net to find these but it can also be a bit daunting. So, which ones are your favorites? Many hacks are lackluster or unfinished, but I feel there are a couple out there I am missing out on.
So far, one of the best games I've found that wasn't released on SNES stateside is Front Mission. There is a lot of complexity there for its era! I guess eventually it came to us on DS, but it is neat to play in its original form. I've enjoyed Return to Dinosaur Land as well. I'm also looking for quality retranslations of games whose original releases were skewed due to censorship or limitations, and possibly pirate games that are any good at all. Let me know what others are out there!