Google Summer of Code is a global program. Students work with an open source organization on a 3 month programming project.
In GSoc '15, I got an exciting opportunity to contribute in an open source project. My mentor was Mr. Ben Smith(Software Engineer, Google) and organization was Portable Native Client, The Chromium Project(Google Chrome).
Native Client is a sandbox for running compiled C and C++ code in the browser efficiently and securely, independent of the user’s operating system.
The goal of this project was to port Tor to Native Client Platform.
In order to achieve this, necessary changes were made in Tor's codebase and any unported dependencies (in case of Tor it was Libevent) so that it can be compiled with Native Client toolchains and can be run in the Chrome browser.
The compiled C code can be run in Chrome which provides the same functionality as the Tor running in the native OS(viz. linux, windows etc).
The project was finished successfully and a couple of extended goals were also achieved.
Later, a Chrome App was also released on webstore, more details about it can be seen here.