With most of the major streaming video services now accounted for, Google needs to look elsewhere to expand its family of Chromecast-compatible apps. Today the company took a big step in that effort, announcing Chromecast support for 10 third-party apps including Vevo and Songza. Google is also paying some attention to advanced users; Plex, an app that's hugely popular among home-theater enthusiasts, has also gained Chromecast support.

"I’m happy to tell you that over the last few months, we’ve been working closely with Google to bring Plex to the Chromecast," said founder Elan Feingold. "It’s an honor for us to be among the first handful of apps on the device, and it’s been great working with Google – we’ve never met a smarter or more energetic group of people to work with." Plex supports video on day one, and the app will be able to cast photos and music "very shortly." "Note that for an initial period, the Chromecast feature is only available to our beloved PlexPass users, who get exclusive access to many new features," Feingold says.

The full list of apps that have added Chromecast support today includes:

• Songza
• Vevo
• Plex
• Red Bull.TV
• Revision 3
• PostTV
• Viki
• BeyondPod
• RealPlayer Cloud
• Avia

Update: The Washington Post has also expanded support for Chromecast today, adding Chromecast buttons to its videos across the web, iPad, and Android apps for tablets and smartphones.