HTML5-based animations is the wave of the future (instead of Flash-based). And there really is not much out there. I think this is a good time for Coffeecup to develop something similar.

Adobe has jumped on the Bandwagon by creating "Edge". "Adobe Edge is a tool for creating standards-based animation with ease; allowing designers to create content, using standards like HTML5, JavaScript, and CSS3." It is cross-platform

http://edge.adobe.com/

Tumult "Hype" competes directly but is Mac OS X only.

http://tumult.com/hype/

And also ... Hippo Studios Animator 1 (Windows only)

http://hippostudios.co.uk/

And also the somewhat obscure "Mugeda" (based in China) is a web-browser based app

https://www.mugeda.com/index.php