darth_llamah released SMS_SDL which is a Sega Master System and GameGear emulator. His work is based on SMS+SDL, which is yet another version of SMS Plus based upon work by Charles Mac Donald and Gregory Montoir.
Changes:
Fixed flickering when leaving the menu with native resolution and aspect fullscreen
AEP-Emu (DE/EN)
DMG Page (DE)
Indie Retro News (EN)
Retroguru (EN)