We make transit easier to use. People want to understand public transportation. We use the web to make it simple. GTFS Manager GTFS Manager is the world’s most used web application for maintaining GTFS data. Transit Alerts Transit Alerts publishes your service alerts in Google Maps using GTFS-realtime. Interactive Maps Show your riders the big picture in a zoomable map that updates with your GTFS. Web Design Trillium builds rider-centric websites with responsive designs—for transit only.