Polymer

General resources

Official Site
Blog
Google+ Profile
Github
Project All things related to the Polymer project - Roadmap, Code of Conduct, How to Contribute, and more.

Polymer boilerplate
Starter kit Build tools & boilerplate for creating production-quality web apps.
Seed element
Polymer Admin Responsive admin dashboard created using Polymer 1.0 and Polymer Starter Kit
Meteor-Polymer Starter Kit Kickstart a Meteor - Polymer project with MWC packages
Meteor-Polymer Starter Kit Including Auth

Generator Polymer Yeoman generator for Polymer projects, based on the official Starter kit.
Generator element Yeoman generator to create Custom Elements using Polymer, X-Tag or VanillaJS.

Elements Catalog
Iron Iron elements are a set of visual and non-visual utility elements.
Paper Paper elements are a set of visual elements that implement Google's Material Design.
Google web components
Gold The gold elements are built for e-commerce use-cases like checkout flows.
Platinum Elements to turn your web page into a true webapp, with push, offline, and more.
Molecules Elements that wrap other javascript libraries.
App Elements that enable building full web apps out of modular custom elements.
Data A collection of data/storage related elements.
Layout A collection of layout related elements.
[Obsolete] Neon Neon elements implement special effects.

App Toolbox App Toolbox.
Polyserve A simple web server for using bower components locally.
Polybuild An all-in-one build tool for Polymer apps.
Polyup A helpful assistant for migrating from Polymer v0.5 to 1.0.
Polylint Detect errors in your code.
Polygit The Magic Server serves files directly from github (via cdn.rawgit.com) in a manner that is compatible with HTML Imports natural deduplication feature.
Polydev DevTool extension.
Polymer Ready Show an icon in the address bar when it detects some Polymer and Custom components.
Vulcanize Build tool for HTMLimports and web components.
Crisper Split inline scripts from an HTML file for CSP compliance.
Snippets for Atom editor
Snippets for Sublime Text editor
Synthesis Use Polymer as the view Layer of Meteor.js
MWC-Layout Control rendering of polymer components.
WC-Loader. Webcomponents webpack loader
Polymer Webpack Loader. Polymer webpack loader.
Polymer CDN. Unofficial CDN for polymer components.
lit-html HTML templates, via JavaScript template literals.

Web components tester Makes testing your web components a breeze!
Web components tester istambul Istanbul coverage plugin for web-component-tester.
test-fixture Element that can simplify the exercise of consistently resetting a test suite's DOM.
iron-test-helpers Utility classes to make testing easier.

Polymer Projects A list of websites and apps built with Polymer

If you want more awesome resources, check the awesome list!