RetroArch is a frontend for emulators, game engines and media players.
Game Boy and Game Boy Color emulator written in C
DS emulator, sorta
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
The original IBM PC and other machine emulations in JavaScript
Game Boy / Game Boy Color / Super Game Boy emulator, debugger
Original Xbox Emulator for Windows, macOS, and Linux
A fast usermode x86 and x86-64 emulator for Arm64
Cemu is a Wii U emulator
Fully-functional open-source server implementation for Diablo 3
A multi-system chiptune tracker compatible with DefleMask modules
Full BIOS collection for RetroPie
A JavaScript NES emulator
Qiling Advanced Binary Emulation Framework
A cycle-accurate Nintendo Game Boy Advance emulator
Full-fledged Android SDK Docker Image
DeSmuME is a Nintendo DS emulator
SummerCart64 - a fully open source N64 flashcart
Gameboy emulator in Java 8
Dolphin is a GameCube / Wii emulator
ares is a cross-platform, open source, multi-system emulator
Third-party TI-84 Plus CE / TI-83 Premium CE emulator
Emulate AWS λ and API Gateway locally
Play! - PlayStation2 Emulator
Emulating Apple Silicon devices