Design Principles - An open source repository of design principles and methods
CADMAPPER - Instant CAD files for any location on earth
Facebook Design Resources - A collection of free resources made by designers at Facebook
MAPACAD - MAPACAD is an online website that is providing leverage to designers and architectures to have the ability to download CAD map cities that can be directly used in their projects.
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
Cadbull - Cadbull is a website that comes with an advanced collection of CAD blocks and DWG design, facilitating architects and designers to get done with their projects efficiently.