I have just completed my third summer of code as a student (and sixth summer of code, if I count all my involvement in the Google Summer of Code, including the 3 years as a mentor with AbiWord, mentoring 2 projects in 2011 and 2012, and in the pool of mentors in 2013).
The code samples can be downloaded here. The work this summer was interesting and rewarding, and I loved the learning experience as much as I did with my first summer of code with AbiWord and second with OGSA-DAI/OMII-UK. Special thanks to my Google Summer of Code 2014 mentor Prof. Ashish Sharma from Emory University, Biomedical Informatics.