This slide deck describes the learnings that came from over 3 years of collaborating on an Open Source multi-application solution for tracking the Greenville, South Carolina Trolleys. This includes a tracking agent, back end server, web, iOS and Android client applications. It is built and maintained by Code for Greenville, an all volunteer group of civic problem solvers. Jeremy Wight shared these learnings as the Product Manager of the Trolley Tracker Application.