NASA WorldWind
Software
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NASA WorldWind is an open-source virtual globe. According to the website, "WorldWind is an open source virtual globe API. WorldWind allows developers to quickly and easily create interactive visualizations of 3D globe, map and geographical... Wikipedia
Developer(s): Ames Research Center (NASA)
License: NASA Open Source Agreement v1.3
Operating system: Cross-platform; see above
Written in: JavaScript (Web), Java (Android, Desktop Java SE, and Server), C# (obsolete Windows/.NET)