Mesen is a multi-system emulator (NES, SNES, Game Boy, PC Engine, Master System/Game Gear) for Windows, Linux and macOS built in C++ and C#.
It also includes an extensive set of debugging tools for homebrew development and romhacking.
Advanced open-source Sega Genesis/Mega Drive, Sega CD, and Master System/Mark III emulator based on portions of Genesis Plus/Gens/Picodrive/Mednafen, designed and tested on the original Droid/Milestone, Xoom, Galaxy S2, Nexus 4, Nexus 7, NVidia Shield, Xperia Tablet Z, and...
GENPlusDroid is an open source Sega Genesis emulator powered by GENPlus. Runs Sega Master System and Sega Mega Drive games. High compatibility, games like Virtual Racing and Phantasy Star work full speed!. Devices with a good GPU can use shaders to increase the graphic quality.