Comprehensive guides to GTFS and GTFS Realtime

Java-based tool that validates General Transit Feed Specification (GTFS)-realtime feeds

The canonical GBFS validator. Maintained by the GBFS community, facilitated by MobilityData.

Canonical GTFS Validator project for schedule (static) files.

Community list of transit APIs, apps, datasets, research, and software 🚌🌟🚋🌟🚂