Transport for Denver, US
HTTP CORS ? Free
RTD
API Endpoint
http://www.rtd-denver.com/gtfs-developer-guide.shtmlMore Transportation APIs
Access real-time and historical data of any and all airborne aircraft
HTTPS CORS ? Free
Get name and website-URL for airports by ICAO code
HTTPS CORS ? Free
Real-time data of any marine and inland vessel equipped with AIS tracking system
HTTP CORS ? apiKey