Official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.

xmpp.org website (builds: https://travis-ci.org/xsf/xmpp.org/builds)

Building Websites with Haunt & GitHub Pages.

Introduction to programming in Scheme

Introduction to building and distributing Android applications

Introduction to R

GNU/Linux app to discover and play internet radio stations

GPS Logging android application with lambdanative.