Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler
Run Linux on the Playstation 2
RetroArch is a frontend for emulators, game engines and media players.
Console based rcon client for minecraft servers.
A cross-platform interpreter for many point-and-click adventure games
A promising chess program
Portable Pokémon Mini Emulator
Generate ready-to-use disc images for your Sega Dreamcast system !
A dead simple 2D game engine for Go
Library for Switch Homebrew
Game engine supporting many 3D/2D formats and graphic effects
NOT UNDER ACTIVE DEVELOPMENT (sorry)
An open-source Phantasy Star Online server for *nix
Web IDE in single HTML file
3D-Accelerated open-source DOOM engine
OviOS Linux