GSoC is a program where several students all over the world (around 1000 every year since 2005) are chosen to work on different open source software projects over a three-month period.
Crystal Space is (quoting from its website):
A mature, full-featured software development kit (SDK) providing real-time 3D graphics for applications such as games and virtual reality.
For the next few months I’ll be working in extending the deferred shading manager with a technique called screen space directional occlusion. In the next days I’ll be posting more details about the project.