For Webmasters: Ordinance Survey OpenSpace Web-Map Builder
Link: OS OpenSpace Mapbuilder application
It's free and easy to use - web-map builder designs your map, as you want it, then prepares and writes the web page (as html code) for you. So when you’ve finished adding markers and routes, collect the final html code and copy it into your web site editor for an instant customised OpenSpace web map. We can even save your project for you, so that you can pick up where you left off.