TriMet has found success with open data and open source software by collaborating with other organizations. They provide open data on their transit routes and schedules through tools like Google Transit. This data is used by third-party developers to build applications that help users plan multi-modal trips within the Portland metro area using TriMet's extensive transit network. TriMet also uses open-source software like OpenTripPlanner for their own trip planning tools, saving costs and allowing for community contributions. Overall, TriMet's embrace of openness has fostered innovation, reduced costs, and improved transit trip planning options for users.