API documentation is publically available from the OpenSpace web site. From their site: OS OpenSpace is a free Ordnance Survey service that allows you to embed Ordnance Survey maps covering England, Scotland and Wales in your web apps. Place any kind of information that has a geographic reference on top of Ordnance Survey maps. Ordnance Survey is Great Britain's national mapping agency. The OS OpenSpace API is a piece of software code you can embed in your web application that provides all the necessary functionality to interact with a map, like panning, zooming in and out, and adding markers and polygons.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.