This document discusses how OpenPlans, a nonprofit organization, uses open data and open source software to work on transportation and livable cities projects. It provides examples of OpenPlans' work including developing OpenTripPlanner for multi-modal trip planning, organizing transportation data hackathons in New York, and coordinating open data standards through Open311. The document advocates for a "government as a platform" approach where agencies provide open data and APIs to enable others to build applications, and notes examples of this occurring in transportation with the adoption of common data standards.