MAME is a multi-purpose emulation framework
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
An experimental Symbian OS emulator
Binary Analysis Platform
Researching Wii U emulation
Yet another system region and language simulator
DeSmuME is a Nintendo DS emulator
DirectX 1-11 to OpenGL wrapper
An open source interactive disassembler
Scriptable frontend for media applications.