This is the mySociety cache of OS OpenData, released 1st April 2010, and other related similarly-licensed data, as allowed under the licences.
An up-to-date list of addresses is vital for local authorities – but they have to pay for the data they created themselves
Here’s a collection of webservices for finding out geographical-related information. There are currently three services available for finding the time zone or local time, the sunrise and sunset times, and the height above sea level at a given latitude and longitude.
The GeoNames geographical database covers all countries and contains over eight million placenames that are available for download free of charge.
Airport Locator, ICAO, and IATA Airport Codes Lookup
Search or browse over 12,000 airports worldwide.