V8_views is a project mainly written in ..., it's free.
V8 Views is a rack middleware javascript template engine powered by V8
A lot of web frameworks make it too easy to bleed business logic and data acquisition into the view layer. Template languages like Mustache/Handlebars make it harder to break out of MVC and this is another step in that direction
Another major advantage of rendering your html in JavaScript is the ability to rendering in the browser.
git clone git://github.com/deadlyicon/v8_views.git
cd v8_views
rackup
open http://127.0.0.1:9292/posts