[marknutter]

It's called Twitter Bootstrap. But seriously, there are any number of standard mobile widgets one can use out there from Bootstrap to JQuery Mobile to Sencha touch if all you want is a boilerplate design for app development. I take it you're not a designer, though, because as soon as you want to create applications that don't look like very other app out there you run into the pain of trying to create custom layouts using iOS and Android native development tools. CSS/HTML is far superior, IMO, to the interface tools you get with XCode and the Android Development Tools.

[flatline3]

"Any number of" and "standard mobile widgets" makes for an oxymoron.

As for working with designers, no, I'm not a designer, but I find that implementing designs in iOS and Android native tools is far easier than attempting to jimmy HTML+CSS into implementing the behavior and layout as provided by a designer.

In the world of views, I can simply position them where I want and apply arbitrary logic to how they move, scale, etc. This makes it tremendously easier to implement complex designs than straight HTML/CSS.