If you type “WebGL” into your favorite search engine, you will find no shortage of hits. However, the key is to get the information that is relevant for you. This appendix compiles a categorized list of my favorite sites. I frequent many of them to find the latest technical information, cutting-edge demos, and thought pieces by the leaders in the community. Happy hunting!
The WebGL standard is developed and maintained by the Khronos Group, the industry body that also governs OpenGL, COLLADA, and other specifications you may have heard of. You can always find the latest version of the official WebGL specification on the Khronos website at http://www.khronos.org/registry/webgl/specs/latest/.
Khronos maintains a public mailing list to discuss drafts of the WebGL specification. You can subscribe to the list, firstname.lastname@example.org, by following the instructions at http://www.khronos.org/webgl/public-mailing-list/.
There is also a Google group for discussing more general WebGL development topics outside of the core specification. You can sign up for this list at https://groups.google.com/forum/?fromgroups#!forum/webgl-dev-list.
The past few years have seen the emergence of several libraries and tools for use with WebGL. Here is a list of some good ones, in no particular order. Some are open source; some are proprietary and may come with licensing restrictions.