Radix Icons - A crisp set of 15×15 icons. Open source.
DWGFREE - DWGFREE is an online platform that comes with a comprehensive collection of CAD blocks that can be downloaded without the need for registration.
Drawcon - Draw your own app icons
CADMAPPER - Instant CAD files for any location on earth
App Icon Template - Royalty free app icon creator for iOS, OS X and Android
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.