Packaged apps for Google Chrome have opened infinite possibilities for the Linux desktop. As more and more developers create Chrome packaged apps, they will be available on Linux too, as opposed to native apps developed for Windows or Mac.
Packaged apps like Google+ photos, Cut the Rope, Any.DO, Exfm etc. behave just as native apps in Ubuntu, and aside from the installation procedure, absolutely nothing separate them from native apps (as far as an end user’s point of view is concerned). The icons of the installed packaged apps show up nicely in both the Ubuntu Dash and Launcher. They do not mix up with the main Chrome Icon, and most of them work offline too.
[Google+ Photos requires a trick to install.]
Some screenshots of Chrome packaged apps running on Ubuntu follow:
A list of available packaged apps (including the above), and links for installation are available in this post.