Here is a comprehensive list of useful resources related to Google Summer of Code (GSoC). You might find these resources useful in case you want to know more about GSoC:
"Check out the information pages from the 2005, 2006, 2007, 2008, 2009, 2010, 2011 and 2012 instances of the program to get a better sense of which projects have participated as mentoring organizations in Google Summer of Code each year. If you are interested in a particular mentoring organization, just click on its name and you'll find more information about the project, a summary of their students' work and actual source code produced by student participants. You may also find the program Frequently Asked Questions (FAQs) pages for each year to be useful (for example, click here for GSoC 2012 FAQ."
If above links don't answer your question(s), you can ask your questions on: