Polymer vs. Mozilla Brick vs. UIkIt

Polymer is a new type of library for the web, designed to leverage the existing browser infrastructure to provide the encapsulation and extendability currently only available in JS libraries. Polymer is based on a set of future technologies, including Shadow DOM, Custom Elements and Model Driven Views. Currently these technologies are implemented as polyfills or shims, but as browsers adopt these features natively, the platform code that drives Polymer evacipates, leaving only the value-adds.

Brick is a collection of UI components designed for the easy and quick building of web application UIs. Brick components are built using the Web Components standard to allow developers to describe the UI of their app using the HTML syntax they already know.

UIkit gives you a comprehensive collection of HTML, CSS, and JS components which is simple to use, easy to customize and extendable.