@web-padawan github.com

since 2018.

ElementInternals's states property and the :state() pseudo class github.com

Solid Element github.com

Library that extends Solid adding Custom Web Components and extensions.

Siemens iX Web Components github.com

Web Components implementing Siemens iX design system.

@lwc/synthetic-shadow github.com

Shadow DOM polyfill by LWC.

ReadyMade github.com

Write custom element classes with decorators. No dependencies.

Momentum UI Web Components github.com

Set of UI components based on Momentum Design.

Fluent UI Web Components github.com

Library of Web Components that supports Microsoft's Fluent design language.

FAST Element github.com

Lightweight library for building performant, memory-efficient, standards-compliant Web Components.

@mateusortiz github.com

in 2014.

Learn Polymer 1.0 youtube.com

Polycasts youtube.com

Summit 2015 youtube.com

Level up Tutorials youtube.com

Platinum webcomponents.org

Paper webcomponents.org

Molecules webcomponents.org

Layout webcomponents.org

Iron webcomponents.org

Gold webcomponents.org

Data webcomponents.org

App webcomponents.org

Elements Catalog webcomponents.org

Google web components webcomponents.org

Twitter twitter.com

StackOverflow stackoverflow.com

Build a real-time to-do app scotch.io

Write web components with ES2015 (ES6) revillweb.com

Polymer Themes polymerthemes.com

Slack channel polymer-slack.herokuapp.com

App Toolbox polymer-project.org

Deploy with Firebase polymer-project.org

Test your elements polymer-project.org

Migration guide polymer-project.org

What is shady DOM polymer-project.org

Encapsulated Routing with Elements polymer-project.org

Building web components using ES6 classes polymer-project.org

Official Site polymer-project.org

Polygit polygit.org

Polystyle poly-style.appspot.com

Google+ Community plus.google.com

Google+ Profile plus.google.com

Using Polymer with Flux and a global app state paulusschoutsen.nl

Snippets for Sublime Text editor packagecontrol.io

open-elements open-elements.org

Generator element npmjs.com

Testing Tips medium.com

How to use Polymer with Webpack medium.com

Polymer loves Redux medium.com

Polymer 3.0 Preview — Building a mini card game medium.com