bng2latlong
HTTPS CORS Free
Convert British OSGB36 easting and northing (British National Grid) to WGS84 latitude and longitude
API Endpoint
https://www.getthedata.com/bng2latlongMore Geocoding APIs
Geolocate website visitors from their IPs
HTTPS CORS apiKey
Actinia is an open source REST API for geographical data that uses GRASS GIS
HTTPS CORS ? apiKey
Get all administrative divisions of a country
HTTPS CORS Free