CADOPOLIS - CAD add-ons, downloads
GLOBAL SPEC - Engineer’s search engine
AMERICAN DESIGN DRAFTING ASSOCIATION - Premier organization for designers, drafters, architects, illustrators and technical artists
EFUNDA - Engineering fundamentals
THOMAS REGISTER - All those big, green books in one place
ASCENT GIS - GIS and Spatial Imaging information
CADALOG - CAD downloads, shareware/freeware, programs
MANUFACTURING RESOURCE - Tons of links for engineers and technicians