Open Street Map
OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world. Two major driving forces behind the establishment and growth of OSM have been restrictions on use or availability of map information across much of the world and the advent of inexpensive portable satellite navigation devices.
Founded by Steve Coast in 2004, it was inspired by the success of Wikipedia and preponderance of proprietary map data in the UK and elsewhere. Since then, it has grown to over 900,000 contributors, who collect data with GPS devices, aerial photography, and other free sources. This crowdsourced data is then made available under the Open Database License. The site is supported by the OpenStreetMap Foundation, a non-profit organization registered in England.
Rather than the map itself, the data generated by the OpenStreetMap project is considered its primary output. This data is then available for use in both traditional applications, like its usage by Craigslist and Foursquare to replace Google Maps, and more unusual roles, like replacing default data included with GPS receivers. This data has been favorably compared with proprietary datasources, though data quality varies worldwide.
Read more about Open Street Map: History, Contributors, Licensing, Using OpenStreetMap, Data Format
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