The Official Khronos WebGL Repository
glTF - the runtime asset format for WebGL, OpenGL ES, and OpenGL.
Khronos reference front-end for GLSL and ESSL
KTX (Khronos Texture) is a lightweight file format for OpenGL textures, designed around how textures are loaded in OpenGL.
Open Source Parallel STL implementation
The Official Khronos WebCL Repository
WebCL 1.2 Working Draft by the WebCL Working Group
Welcome to the COLLADA Conformance Test Suite
WebGL performance regression tests
Presentations for SIGGRAPH 2012 course "Graphics Programming on the Web" covering HTML5 technologies (Canvas, CSS, etc.), WebGL and WebCL