Ivan Starkov sent in an isomorphic Google Maps component for React (GitHub: istarkov/google-map-react, License: MIT, npm: google-map-react). It provides several useful features, including rendering any React component over maps, lazy loading of the Google Maps API, and isomorphic rendering.
The ability to render any React component over a map means you make dynamic map features that feel very fast -- Ivan's library calculates the co-ordinates independently of Google Maps, so you can treat your React code separately instead of worrying too much about how it relates to Google Maps.
Now every object on the map can be hovered (however, you can still use css hover selectors if you want). If you try zooming out here example, you will still be able to hover on almost every map marker.
This algorithm allows you to tweak hover probability of map objects, for example making some objects "more hoverable". distance_hover example with different hover probabilities
The main example shows a map combined with fast infinite scrolling, SVG icons, and balloons made with React.
MyScript is a service for handwriting and handwritten shape recognition. Gregory Pakosz sent in some Polymer MyScript components for interacting with the service. The components are built with MyScriptJS, and they cover things like mathematical expression and text recognition.
The demos on the MyScript Web Components homepage are interactive, so if you select the
<myscript-math> example and press play you should be able to draw some equations and see the results.