Dolphin is an emulator for two recent Nintendo video game consoles: the GameCube and the Wii. It allows PC gamers to enjoy games for these two consoles in full HD (1080p) with several enhancements: compatibility with all PC controllers, turbo speed, networked multiplayer, and even more!
I ( @aldoiljazi ), added some info:
Is it Open Source: yes
Link to source tarball/zip file: https://github.com/dolphin-emu/dolphin/archive/5.0.tar.gz