Make games with Lego-like building blocks
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
Free and Open Game Programming Language for Windows and GNU/Linux
Orx: Portable Game Engine
Asphyre is a cross-platform framework for Delphi and FreePascal.
INSTEAD - Simple Text Adventure Interpreter.
A starter development kit that let you develop FF6-like games on PC.
IRB is a game creation toolkit
3D .NET engine for Windows, Linux, Mac
Molecular viewer and prototyping framework
Ze Text Adventure game Builder : Create as you play !
8-bit Graphical API for Java
Open Source Virtual World and MMOG Development Platform
A lightweight HTML5 Game Engine