Command & Conquer: Remastered Collection
Free game engine for development of desktop, mobile, and web games
3D Game engine with editor
Cross-platform, open source, and super fast MUD client with scripting
Descent 3 by Outrage Entertainment
OgreWin3D
Action RPG that's easy to mod
Modern Windows fork of FCEUX NES/Famicom emulator.
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
LDraw™ editor for LEGO® style digital building instructions.
A promising chess program
Updated emulator of Forgotten Realms: Unlimited Adventures
3D C++ Game Engine - yet another open source game engine
A 2D game engine and level editor
Create, save, copy and edit tengwar texts with this application.
A mapping tool for text-based games like text adventures, MUDs, etc.
Karel - 3D language interpreter
An ASCII Rougelike - RPG
EE Keeper is a saved game editor for Baldur's Gate Enhanced Edition.
2D ARPG Engine
Source code of a text adventure game.
Grepolis utility
Multi-platform game engine similar to old Megaman with a stage editor
evolution for vegastrike SpaceSim/Combat/Trade game