This is a Multi-Machine emulator called MEKA. It was first developed for working under MS-DOS & the first release for Windows was 0.62c and now you are able to play under Linux too.
At first, it was started as a Sega Master System emulator, by now it supports several systems:
Sega Game 1000 (SG-1000)
Sega Computer 3000 (SC-3000)
Sega Super Control Station (SF-7000)
Sega Mark III (+ FM Unit)
Sega Master System (SMS)
Sega Game Gear (GG)
Othello Multivision (OMV)
Most of the games are fully playable, only a few won't work well, just in case check the compatibility list.