Cesium is built with care, code is publicly peer-reviewed, is unit tested with over 90% code coverage, and is statically analyzed, documented, and developed by an experienced team. Cesium is built with care, code is publicly peer-reviewed, is unit tested with over 90% code coverage, and is statically analyzed, from multiple sources, including WMS, TMS, WMTS, Bing Maps, Mapbox, Google Earth Enterprise, OpenStreetMap, ArcGIS MapServer, standard image files, and custom tiling schemes. Each layer can be alpha-blended with the layers below it, and its brightness, contrast, gamma, hue, and saturation can be dynamically changed. navigation with mouse and touch handlers for rotate, zoom, pan with inertia, flights, free look, and terrain collision detection. Reference frames such as World Geodetic System (WGS84), International Celestial Reference Frame (ICRF), and east-north-up. Use Cesium as a single .js file (plus .css and web-workers .js files) or with Asynchronous Module Definition (AMD) to include only what you use. Source.