At launch, not much besides Netflix and YouTube worked on Chromecast, but quite a few other services have become integrated with the device since them. They include video, music, news, media storage and sharing apps, and even Google's own Internet browser, Chrome, with some caveats.
The following could be launched on Chromecast as of early 2014:
- HBO Go
- Hulu Plus
- RealPlayer Cloud
- Red Bull.TV
- Google Play Music
- Google Play TV & Movies
- Plus any tab on your Chrome browser, if you add the Google Cast Extension to the browser.
The Chrome browser tab-casting feature is still in beta on all but a few Chromecast optimized Web sites as of January 2014. It doesn't work yet from smartphone Chrome browsers and requires a fast computer on a fast WiFi network with a strong connection to function properly.
You will, of course, need to register, and in some cases pay, for many of the services listed above in order to stream content from them.