PCSX2 - The Playstation 2 Emulator
OTHER License
Multi-system emulator (NES, SNES, GB, GBA, PCE, SMS/GG) for Windows, Linux and macOS
Cemu - Wii U emulator
A work-in-progress PlayStation 4 emulator.
PS3 emulator/debugger
Multi-Platform Gamepad Firmware for Raspberry Pi Pico and other RP2040 boards
N64 Emulator
Cycle-accurate NES emulator in ~1000 lines of code
bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.
Xbox 360 Emulator Research Project
PCSX2 usb plugin for wheels and increasingly more stuff
Experimental PlayStation Vita emulator
Third-party TI-84 Plus CE / TI-83 Premium CE emulator, focused on developer features
Xbox (Original) Emulator