Vaadin has a high quality component set for building mobile and desktop web applications in modern browsers
Ready to use Polymer elements in GWT projects
Modular implementation of Material Design for Mithril.
Polymer and web components for Ruby on Rails
Polymer Web App for The Web Platform Podcast
GDG chapter page using polymer (donated by GDG Twin Cities)
A client/server Dart application using Polymer and Firebase.
Yeoman generator for scaffolding Polymer apps
Useful filters for Polymer
Express and Polymer scaffolding using Yeoman
General discussion and support for web components.