Don't forget to take a look at http://x-tag.github.io http://x-tag.github.io especially if you're looking for alternatives to Polymers take on a Web components.

Don't forget to take a look at http://x-tag.github.io http://x-tag.github.io especially if you're looking for alternatives to Polymers take on a Web components. Haven't used either extensively yet but x-tag seems more bare metal.