1. https://tile38.com

    A free server that can scale to handle your real-time geofencing and other geo-related needed. They also include a bunch of sample code that shows how to interface with this lib from various languages

  2. https://github.com/danklammer/bytesize-icons

    a set of icons in SVG (no need for JS to render them) to be used in your apps. MIT licensed.

  3. http://colebemis.com/feather/