Desktop/Android/HTML5/iOS Java game development framework
RenderDoc is a stand-alone graphics debugging tool
stb single-file public domain libraries for C/C++
Memory Efficient Serialization Library
Open source Cardboard SDK and samples
The open-asset-importer-library repository
LÖVE is an awesome 2D game framework for Lua
Orx: Portable Game Engine
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Free and Open Game Programming Language for Windows and GNU/Linux
Open-source, cross-platform, game-development tools
Build Cross-platform Applications
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Highly customizable library for procedural world generation
A cross-platform interpreter for many point-and-click adventure games
Realtime 3D engine for game development
The solution to all your problems