GitHub – public-apis/public-apis: A collective list of free APIs

ADS-B Exchange
Access real-time and historical data of any and all airborne aircraft
No
Yes
Unknown

airportsapi
Get name and website-URL for airports by ICAO code
No
Yes
Unknown

AIS Hub
Real-time data of any marine and inland vessel equipped with AIS tracking system
apiKey
No
Unknown

Amadeus for Developers
Travel Search – Limited usage
OAuth
Yes
Unknown

apilayer aviationstack
Real-time Flight Status & Global Aviation Data API
OAuth
Yes
Unknown

AviationAPI
FAA Aeronautical Charts and Publications, Airport Information, and Airport Weather
No
Yes
No

AZ511
Access traffic data from the ADOT API
apiKey
Yes
Unknown

Bay Area Rapid Transit
Stations and predicted arrivals for BART
apiKey
No
Unknown

BC Ferries
Sailing times and capacities for BC Ferries
No
Yes
Yes

BIC-Boxtech
Container technical detail for the global container fleet
OAuth
Yes
Unknown

BlaBlaCar
Search car sharing trips
apiKey
Yes
Unknown

Boston MBTA Transit
Stations and predicted arrivals for MBTA
apiKey
Yes
Unknown

Community Transit
Transitland API
No
Yes
Unknown

Compare Flight Prices
API for comparing flight prices across platforms
apiKey
Yes
Unknown

CTS
CTS Realtime API
apiKey
Yes
Yes

Grab
Track deliveries, ride fares, payments and loyalty points
OAuth
Yes
Unknown

GraphHopper
A-to-B routing with turn-by-turn instructions
apiKey
Yes
Unknown

Icelandic APIs
Open APIs that deliver services in or regarding Iceland
No
Yes
Unknown

Impala Hotel Bookings
Hotel content, rates and room bookings
apiKey
Yes
No

Izi
Audio guide for travellers
apiKey
Yes
Unknown

Land Transport Authority DataMall, Singapore
Singapore transport information
apiKey
No
Unknown

Metro Lisboa
Delays in subway lines
No
No
No

Navitia
The open API for building cool stuff with transport data
apiKey
Yes
Unknown

Open Charge Map
Global public registry of electric vehicle charging locations
apiKey
Yes
Yes

OpenSky Network
Free real-time ADS-B aviation data
No
Yes
Unknown

Railway Transport for France
SNCF public API
apiKey
Yes
Unknown

REFUGE Restrooms
Provides safe restroom access for transgender, intersex and gender nonconforming individuals
No
Yes
Unknown

Sabre for Developers
Travel Search – Limited usage
apiKey
Yes
Unknown

Schiphol Airport
Schiphol
apiKey
Yes
Unknown

Tankerkoenig
German realtime gas/diesel prices
apiKey
Yes
Yes

TransitLand
Transit Aggregation
No
Yes
Unknown

Transport for Atlanta, US
Marta
No
No
Unknown

Transport for Auckland, New Zealand
Auckland Transport
No
Yes
Unknown

Transport for Belgium
The iRail API is a third-party API for Belgian public transport by train
No
Yes
Yes

Transport for Berlin, Germany
Third-party VBB API
No
Yes
Unknown

Transport for Bordeaux, France
Bordeaux Métropole public transport and more (France)
apiKey
Yes
Unknown

Transport for Budapest, Hungary
Budapest public transport API
No
Yes
Unknown

Transport for Chicago, US
Chicago Transit Authority (CTA)
apiKey
No
Unknown

Transport for Czech Republic
Czech transport API
No
Yes
Unknown

Transport for Denver, US
RTD
No
No
Unknown

Transport for Finland
Finnish transport API
No
Yes
Unknown

Transport for Germany
Deutsche Bahn (DB) API
apiKey
No
Unknown

Transport for Grenoble, France
Grenoble public transport
No
No
No

Transport for Hessen, Germany
RMV API (Public Transport in Hessen)
No
Yes
Unknown

Transport for Honolulu, US
Honolulu Transportation Information
apiKey
No
Unknown

Transport for Lisbon, Portugal
Data about buses routes, parking and traffic
apiKey
Yes
Unknown

Transport for London, England
TfL API
apiKey
Yes
Unknown

Transport for Los Angeles, US
Data about positions of Metro vehicles in real time and travel their routes
No
Yes
Unknown

Transport for Manchester, England
TfGM transport network data
apiKey
Yes
No

Transport for Norway
Transport APIs and dataset for Norway
No
Yes
Unknown

Transport for Ottawa, Canada
OC Transpo API
apiKey
Yes
Unknown

Transport for Paris, France
RATP Open Data API
No
No
Unknown

Transport for Philadelphia, US
SEPTA APIs
No
No
Unknown

Transport for Sao Paulo, Brazil
SPTrans
OAuth
No
Unknown

Transport for Spain
Public trains of Spain
No
Yes
Unknown

Transport for Sweden
Public Transport consumer
OAuth
Yes
Unknown

Transport for Switzerland
Official Swiss Public Transport Open Data
apiKey
Yes
Unknown

Transport for Switzerland
Swiss public transport API
No
Yes
Unknown

Transport for The Netherlands
NS, only trains
apiKey
No
Unknown

Transport for The Netherlands
OVAPI, country-wide public transport
No
Yes
Unknown

Transport for Toronto, Canada
TTC
No
Yes
Unknown

Transport for UK
Transport API and dataset for UK
apiKey
Yes
Unknown

Transport for United States
NextBus API
No
No
Unknown

Transport for Vancouver, Canada
TransLink
OAuth
Yes
Unknown

Transport for Washington, US
Washington Metro transport API
OAuth
Yes
Unknown

transport.rest
Community maintained, developer-friendly public transport API
No
Yes
Yes

Tripadvisor
Rating content for a hotel, restaurant, attraction or destination
apiKey
Yes
Unknown

Uber
Uber ride requests and price estimation
OAuth
Yes
Yes

Velib metropolis, Paris, France
Velib Open Data API
No
Yes
No