JavaScript Framework Dust:
http://akdubya.github.io/dustjs/#guide
AngularJS versus Dust
Refer: http://stackoverflow.com/questions/15336187/what-is-the-difference-between-angularjs-and-dust-js
Dust.js is purely a templating module. So, it allows the combination of json with a template to deliver html output.
Angular.js is client side framework that allows binding of logic to variables defined in a template (your page).
So, with dust.js you are responsible for deciding when to run the json through the template. Typically you feed in the json on the server (or client) and ask it to render the results.
With angular.js when the model (the json) changes the framework re-renders as appropriate. Triggers for that change could be user actions (such as filling a form in) or it could be due to loading some fresh json from a service.
Typically you would use angular.js if you want a single page JS app (think gmail). dust.js is perhaps more akin to a traditional approach with multi pages with content driven by passing in json.
You could even use the both of them in tandem - server side rendering using dust.js with dynamic client side logic in angular.js.