Like sc1103 said. There was also NGPocket Color, which SHOULD run on most NGPocket emulators (though I recall at least one case where that wasn't true)
I owned an NGPocket color, and frankly it was the best, THE BEST! pocket system ever. There weren't many games for it, but most of them were extremely well done and very fun to play. I DO have an NGP emulator on my cab because the games translate very well to a cab system... even with the graphics blown up way above what they were originally intended for.