A GDG "Garage" is a hands-on working session, typically with a small but active group of participants, aimed at making progress on a specific task. In the case of the summit, GDG Garage sessions were selected from submitted proposals based on popular vote.
A GDG initiative to create a crowdsourced knowledge base that can serve as a single location both for finding information (typically by providing links to the definitive resource) and for finding or sharing expertise and perspectives from community members (typically in the form of Q&A)