Gens is a win32/unix Sega Genesis / Sega CD / Sega 32X emulator.
Mednafen is a portable, utilizing OpenGL and SDL, argument(command-line)-driven multi-system emulator.
Complete, Fast, Accurate, Game Boy/CGB/SGB Emulator.
RealBoy is a Complete, Fast, Accurate, Free/Open-Source Game Boy, Game Boy Color and Super Game Boy Emulator for Linux/Unix.
An open-source Phantasy Star Online server for *nix
Sylverant is an open-source server for the Phantasy Star Online series of games by Sega, written primarily for Unix-like operating systems. Sylverant has at least partial support for most versions of Phantasy Star Online, from the Network Trial for the Dreamcast through Blue Burst for Windows.
Forgotten Destruction is a free real-time strategy game developed using the Simple DirectMedia Layer. It focuses on the conflict between an evil shadowy empire and human race with their nearby allies.
A wrapper for the Aerowinx 744 Precision Simulator (http://aerowinx.com, also known as "PS1", a DOS flight sim) that executes the sim without emulators, and extends its functionality with advanced audio, input device and network capabilities.
CM Game Development Kit
The CMGDK is an game engine useable in C++11. It is completely cross-platform, using OpenGL Core 3.3(need DSA,VAB) and OpenAL.
A techonogically advanced engine using C++ and ASM as languages.
A techonogically advanced engine using C++ and ASM as languages, with improved performance and a almost virtually infinite triangle count support, even on slower and older machines. It haves a full shader system, physics system (DOE Based), 100% physically correct lightning and colour grading, and supports various popular formats in 3D modelling and gaming scene. It was previously under a heavy eula policy, but now is under GPL because of internal problems.
FreeBASIC.net's "FreeBASIC" BASIC SDK and compiler project space.
Soccer manager with many new features, 2D/3D match engine, it will be released under GPL for Windows and Linux. OSM will include built-in database viewer/editor. Also all world leagues will be in. Over 50 statistics per player.
A portable version of the ProQuake Quake1 (NetQuake) engine.
Simontacchi is a Winboard/UCI compatible chess engine that intends to grow via development community involvement. The goal of the project is to create a chess engine that rivals the strongest commericial and amateur programs.
It`s site for projects from tdp and our friends.
A stripped-down, OpenGL-only version of QuakeWorld based on ezQuake designed for league play.