Game Boy / Game Boy Color / Super Game Boy emulator, debugger
The Playstation 2 emulator
Cemu is a Wii U emulator
DOSBox Staging is a modern continuation of DOSBox
MAME is a multi-purpose emulation framework
Xbox 360 Emulator Research Project
Play! - PlayStation2 Emulator
ares is a cross-platform, open source, multi-system emulator
A cross platform, customizable graphical frontend
A latency-hating emulator of: the Acorn Electron, BBC Micro
Modern Windows fork of FCEUX NES/Famicom emulator.
Software development for 4Mb portable, using Z80 CPU and AA batteries
A gameboy emulator that only plays Pokemon Blue, in ~50 lines of c++.
Nestopia UE
Binary Analysis Platform
Triton is a dynamic binary analysis library
An uneducated try to resurrect and modernize the Nuance NUON emulator
DeSmuME is a Nintendo DS emulator
MAME Android Emulator.
Super Nintendo (SNES) emulator focused on performance, features
higan is a multi-system emulator focused on accuracy & preservation
Atari 2600, C64, Python, 3D engines and rock'n roll