Joyrider released his port of SMS Plus SDL (based on Dosfish’s initial port) for Dingux.
It is the aligned version and should run full speed on all games both Game Gear and Master System. Joyrider has implemented the same menu system as used with Dingux GNUBoy.
You can scale to native resolution, fullscreen stretched and fullscreen aspect. There is volume control added in as well multiple save state saves (max 9 per game).