Memory Efficient Serialization Library
Desktop/Android/HTML5/iOS Java game development framework
Open source Cardboard SDK and samples
Orx: Portable Game Engine
an object-oriented language with late binding
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Highly customizable library for procedural world generation
Realtime 3D engine for game development