EmuNations

BGB is a Gameboy emulator which lets you run Gameboy and Gameboy Color games. It has excellent accuracy, gamepad support, high quality sound and graphics, smooth V-sync animation, and low latency...

The "PlayStation Portable Simulator Suitable for Playing Portably" is a multi-platform, open-source emulator written in C++ with the aim of speed and portability. It can run PSP games in full HD resolution with upscaling textures to reduce bluriness and most games are playable...

Mesen is a multi-system emulator (NES, SNES, Game Boy and PC Engine) for Windows & Linux built in C++ and C#. It focuses on accuracy, though does incorporate graphic mappers and filters (i.e. HD packs in HDNes format as well). It also allows video recording...