The source code to VVVVVV
The flexible game engine
Command & Conquer: Remastered Collection
Free game engine for development of desktop, mobile, and web games
Stride (formerly Xenko), a free and open-source cross-platform C# game
3D Game engine with editor
Cross-platform, open source, and super fast MUD client with scripting
Descent 3 by Outrage Entertainment
High performance UI layout library in C
A game framework written with osu! in mind.
Games for tomorrow's programmers
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
OgreWin3D
Modern Windows fork of FCEUX NES/Famicom emulator.
Action RPG that's easy to mod
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
A cross-platform port of Hexen II game.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
LDraw™ editor for LEGO® style digital building instructions.
A promising chess program
ENDEDIT is a B800 text screen editor
Galgame's Multilingual Real-time Machine Translation Tool
Updated emulator of Forgotten Realms: Unlimited Adventures
A cross-platform, open-source, pure C game engine for mobile game
An elegant Go board and SGF editor for a more civilized age