Chocolate Doom is a Doom source port that is minimalist and historically accurate.

Godot Engine – Multi-platform 2D and 3D game engine

Build engine port backed by GZDoom tech. Currently supports Duke Nukem 3D, Blood, Shadow Warrior, Redneck Rampage and Powerslave/Exhumed.

Cross-platform Amiga emulator with a slight focus on gaming, but also with solid support for productivity apps including just-in-time (JIT) compilation.

GZDoom is a feature centric port for all Doom engine games, based on ZDoom, adding an OpenGL renderer and powerful scripting capabilities

Freedoom is an entirely free software game based on the Doom engine.

vAmiga is a user-friendly Amiga 500, 1000, 2000 emulator for macOS

id Software's Quake 2 v3.21 with mission packs and Vulkan support (Windows, Linux, macOS, FreeBSD, Raspberry Pi 4)

The Yamagi Quake II client

DOSBox Staging is a modern continuation of DOSBox with advanced features and current development practices.

A multi-platform software synthesiser emulating pre-GM MIDI devices such as the Roland MT-32, CM-32L, CM-64 and LAPC-I. In no way endorsed by or affiliated with Roland Corp.

🕹 Retro video game emulation for macOS

Optimized Amiga emulator for Linux/macOS

Diablo build for modern operating systems

BBC micro emulator for Apple Mac

Vulkan Quake port based on QuakeSpasm

Shockolate - A minimalist and cross platform System Shock source port.

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

Cross-platform port of Arx Fatalis, a first-person role-playing game