HEATKEYS

GrabCAD - a free CAD model library with 2D / 3D CAD files available for software like SolidWorks, AutoCAD, Autodesk Inventor, Solid Edge, SketchUp etc.

3D models for CAD/CAM/CAE designers. Cars, cities, airplanes and other polygonal and NURBS/SOLID models.

Tinkercad is an easy-to-use 3D CAD design tool. Quickly turn your idea into a CAD model for a 3D printer with Tinkercad.

archinoah.com is a architecture network for architects, interior architects, urban planners, engineers and students of these branches.

TFD Encyclopedia includes Computer Desktop Encyclopedia, Columbia Encyclopedia and many other great sources.

AutomationDirect - Industrial control products: PLCs, AC Drives, Operator Interfaces, Enclosures, Pushbuttons, Sensors, Motor Controls, Power Supplies, and more!

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

CADTutor provides free video tutorials, articles, downloads and a busy community forum for users of AutoCAD and associated software.

The Penn State College of Agricultural Sciences publication database is searchable collection of on-line publications, fact sheets,and information graphics

B2BDiscover.com: Discovering millions of B2B business contacts over the world.

Spirit Tree Inn is the Southern Arizona Bed and Breakfast in Patagonia, Arizona you can choose as your Tucson, AZ lodging

CourseHorse is an online marketplace for all types of amazing, trusted local classes. You are what you learn.