I've written a wikibook on GLSL (OpenGL Shading Language) programming to support a course that I've been teaching in October 2011. One of the basic ideas is to introduce learners to the way GLSL is used in context, in particular in Unity, Blender, and OpenGL+GLUT. This could be extended to WebGL, Android, and iOS. Notable feature: section numbers in the PDF version.
I've been working a bit on reorganizing German, making the Level II levels accessible again and trying to integrate the exercises in the Level I lessons. There is still a lot of work to do on this book but I'm not really finding the time or motivation to do it.
I'm the main author of Spanish by Choice, a collection of wikibooklets for everyone who wants to learn Spanish. With this wikibook I've also been trying to better understand the possibilities of wikibooks in general. There could be a lot of stuff done with the Novelas Cortas because there are excellent open-source audio recordings available but I'm not quite sure how to do it with reasonable effort.
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