Applications
Construction and Maintenance, File and Batch Processing, Productivity Utilities, ACADstore, AccuRender, Aceri, S.A., AMC Inc., Articulate Solutions Partnership, ASVIC Engineering Software, Auto-Z, Autodesk Partner Products, AutoSolids, AuxiSystems, Inc.
Development
AutoLISP, VBA, AfraLisp, AJaX - the AutoCAD/Java eXtension, ARX LT SDK, AutoCAD Developers Group Europe, AutoCAD Exposed, ObjectDCL, OpenDWG Alliance, Py_acad, Ransen's ObjectARX Course, xarch AutoCAD Info and Tools
Education
3D CADCEA - Fundamental 3D Design with AutoCAD and, ActionCAD, Advanced Training Center, AutoCad Training Videos by Keystone, AutoCAD Tutorial, Basics of AutoCAD, cad4theatre, CadCARD Slidechart, CADTutor, California CAD TCHR
Libraries
Abscissa 3D Models, AHatch Pro, Autocad Detail Library, AutoCAD Iobjects, CAD-O Designer Databases, Ltd., CadToolsOnline.com, Ceco.net, Code Zebra, Inc., Compugraphx, E-Interiors.net
User Groups
AutoCAD Developers Group Europe, AutoCAD User Group for Silicon Valley and San Jose, AutoCAD Users Forum, Autodesk User Group International AUGI, Gateway Autodesk User Group, GCAUG - Greater Chicago AutoCAD User's Group, Peninsula AutoCAD User Group, Professional AutoCAD Users Group (PAUG), San Antonio AutoCAD User's Group, South Plains AutoCAD Users Group
Adee's AutoCAD Answers
Answers to Frequently asked AutoCAD Questions.
Autocadzone
Free AutoCAD help and tips, tutorials and video tutorials, and student examples of 3D models.
Autodesk Point A
A second portal by Autodesk that helps designers to locate industry resources, with additional services for subscribers.
Autodesk, Inc.
The creators of AutoCAD. Includes the searchable support database, a download area and discussion groups.
CAD Forum
Database of tips and tricks for AutoCAD, AutoCAD LT, 3D Studio, Inventor and other products by Autodesk and HP.
Cadalyst: Bugwatch
A monthly column documenting old and new bugs in AutoCAD and their workarounds or fixes, where available.
Cadopolis.com
Commercial portal for products and services related to AutoCAD, with add-ons, shareware, forums and links. [Requires Javascript]
Draftsperson.net
Presents material about drafting with AutoCAD. With tips and tricks, a Lisp tutorial, a block library, and information about standards.
The Autodesk File
A history of Autodesk and AutoCAD by John Walker, the founder of Autodesk.
The CAD Depot
A repository of freeware and shareware tools for use with AutoCAD and other CAD systems.