CAD Communities
Allplan, ArchiCAD, Ashlar-Vellum, AutoCAD, AutoCAD LT, Autodesk Architectural Desktop, Autodesk Land Desktop, Autodesk Revit, Autodesk VIZ, CADVANCE, CoCreate, DataCAD, DesignCAD, General CADD, IntelliCAD, Intergraph, MEDUSA, MicroStation, TurboCAD, User Groups, VectorWorks, Visio, Visual CADD

Collaboration
application service providers, project portals, products and companies, software

Events

MCAD - communities, products and companies, reference, services and consultants

Products and Companies
2D, 2D to 3D, AEC, CAD stores-online, CAM, civil engineering, diagramming, electrical, FM, general purpose CAD, graphics and animation, home design, industrial design, landscape design, marine design, Mac, parts, PDF, piping, plotting, prototyping, raster to vector, reverse engineering, specialized, standards, structural, surface modeling, viewers

Reference
blogs, CAD management, directories, jobs, mailing lists, newsgroups, organizations, people, portals, publications

Services and Consultants
general CAD services, AEC, dealers, market research, paper to CAD, patents and prototypes, printing and plotting, rapid prototyping, setup and planning, structural design, visualization and multimedia

Translation
2D to 3D, interoperability organizations, online translation, translation services, translation software