OpenStreetMap.org

OpenStreetMap.org (OSM) provides users the ability to edit and download street maps for free through open source licensing.  Check out more background information about OSM at Wikipedia.

Open source GIS software like QGIS also have add-ons to aid in the download process. Alternatively, you can download the data directly from its website or connect to a WMS server.  You can also use OSM maps as base layers in Open Layers for web publishing.

Companies, including Apple, have recognized OSM's value--Apple uses OSM in its iPhoto app.  Most of the map's symbology is relatively straightfoward, but you can also check out its wiki to find an extensive list.  Below the Florida keys are shown. Click the photo for a more detailed image.  Be sure to check out this terrific resource!


The Florida Keys