OpenLayers makes it easy for web developers to embed dynamic maps, from a multitue of sources, in any web page. OpenLayers provides an extensive list of mapping tools and widgets, similar to Google Maps. All functionaly runs inside the web browser, which makes OpenLayers easy to install, without any server side dependencies.
OpenLayers is renound for its comprehensive testing and release cycles, ensuring stability across the hundreds of different browser versions.
Website: http://openlayers.org
License: MIT-style license
Software Version: 2.9.1
API Interface: JavaScript
Support: http://trac.openlayers.org