- Updated 7 years agoOrdnance SurveyA dataset providing a link to Ordnance Survey open data products. These tools are available to download free of charge under an open government licence. The tools are: OS Open Map - local (beta) a detailed, street level, vector mapping open data product. OS Open names - definitive place names, road numbers and post codes in Great Britain. OS Open rivers (beta) - a high level view of the water network, with generalised geometry an...