Google Code Jam, Google’s largest coding competition, calls on programmers around the world to put their skills to the test by solving multiple rounds of algorithmic puzzles.
Google Code Jam Kickstart for university students looking to develop their coding skills and potentially pursue a Google career.
Google #Hash Code for students in Africa, Europe, and the Middle East looking to work as a team on real Google problems.
Google Summer of Code is a global program focused on introducing students to open source software development. Students work on a 3 month programming project with an open source organization during their break from university.
Rosetta Code - The idea is to present solutions to the same task in as many different languages as possible, to demonstrate how languages are similar and different, and to aid a person with a grounding in one approach to a problem in learning another.