Busbuzzard

R5: Rapid Realistic Routing on Real-world and Reimagined networks

Developed to power Conveyal's web-based interface for scenario planning and land-use/transport accessibility analysis, R5 is our routing engine for multimodal (transit/bike/walk/car) networks with a particular focus on public transit

ESRI public-transit-tools

Tools for working with GTFS public transit data in ArcGIS

tidytransit

R package for working with GTFS data

gtfstools

General Transit Feed Specification (GTFS) Editing and Analysing Tools