RetroArch is a frontend for emulators, game engines and media players.
Cemu is a Wii U emulator
A fast usermode x86 and x86-64 emulator for Arm64
A cycle-accurate Nintendo Game Boy Advance emulator
DS emulator, sorta
Compact cycle-accurate NES emulator
A web-based frontend for RetroArch
Fully-functional open-source server implementation for Diablo 3
Dolphin is a GameCube / Wii emulator
mGBA Game Boy Advance Emulator
DeSmuME is a Nintendo DS emulator
ares is a cross-platform, open source, multi-system emulator
Third-party TI-84 Plus CE / TI-83 Premium CE emulator
Full BIOS collection for RetroPie
A multi-system chiptune tracker compatible with DefleMask modules
x86 PC emulator and x86-to-wasm JIT, running in the browser
Play! - PlayStation2 Emulator
Qiling Advanced Binary Emulation Framework
Emulate AWS λ and API Gateway locally
The original IBM PC and other machine emulations in JavaScript
Emulating Apple Silicon devices
An NES emulator in C++
Retro emulation for the ODROID-GO and other ESP32 devices
Experimental C# Playstation Emulator
BigQuery emulator server implemented in Go