DWGFREE - DWGFREE is an online platform that comes with a comprehensive collection of CAD blocks that can be downloaded without the need for registration.
ChemDraw - ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.
CADMAPPER - Instant CAD files for any location on earth
Cortellis - Enter your description
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.
ImageJ - and Other Health Care