A week or two after Chromecast hit the streets, we started to see all kinds of unofficial applications for Google's HDMI streamer, many of which came from CyanogenMod Team member and ClockworkMod creator Koushik "Koush" Dutta. Now he's worked around the developer whitelist for Chromecast, allowing his app to be used on any Android device and with any Chromecast. He's calling it AirCast, and it's available for a test download now.
The app allows users to stream video to a Chromecast TV from the gallery app on your local Android device, or from your Google Drive or Dropbox account. The app itself doesn't do much as far as the interface is concerned, it just adds the distinctive Chromecast button to the relevant sections of those apps. Local files are played across the WiFi network from your Android device to Chromecast, while cloud files pull down from the Internet. If Koush's previous videos are anything to go by, RSS feeds may be next.
The AirCast app is in a truly limited beta stage: the APK will cease to function (self-destruct) in two days. But given how fast Koush works, I'd be surprised if AirCast wasn't available in a wider beta soon, or maybe even baked into an upcoming CyanogenMod nightly. Dutta has stated that the first issue with the app is that it is incompatible with some non-AOSP Gallery apps, like the Sense gallery on the HTC One.
Source: Koushik Dutta (Google+)