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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
HardKernel makesa a few ODROID models that come with available Android TV builds. Some have the same chipset as the AMLogic on the CCwGTV 4K and they aren't terribly expensive. If I wanted an open source Chromecast replacement I'd go for that.