Google will soon open-source Google Earth Enterprise
"This means that GEE Fusion, Server and Portable Server (that’s a total of 470,000 lines of code) will be available on GitHub under the Apache 2 license in March. The company explicitly notes that neither the GEE Client, nor the Google Maps JavaScript API V3 or the Google Earth API will be open sourced. The company will continue to update the Enterprise Client, though." Not the client, unfortunately.
[Duplicate comment]
[Duplicate comment]