CADClick  
   A database for mechanical engineers that offers access to CAD geometries from different suppliers on mechanical engineering.
   http://www.cadclick.de/

Human Figure Data  
   Human-figure data sets for architectural drawings in DXF, MCD VectorWorks, and EPS format. Free download after registration, or purchase of CD-ROM [requires Flash].
   http://www.sum-cd.com/

kit3Dmodels  
   Collection of 3D furniture models in Max3.0 and DXF format, with some free sample downloads.
   http://www.kit3dmodels.com/

Parts Works  
   Online 2D/3D parts library for Solidworks, AutoCAD and other software, in formats including ACIS SAT, DXF, DWG, and IGES.
   http://www.partsworks.com/

Vanguard Software GmbH  
   Offers partsCAT, an electronic spare parts catalogue software for publishing catalogues on CD-ROM and online.
   http://www.vanguard.at/en/

PARTsolutions  
   A parts library integrated with many CAD systems for direct invocation, as well as with standard data formats.
   http://www.partsolutions.de/index.asp?sid=2

ModelCAD  
   A library of 2D and 3D architectural symbols in DWG and 3DS format on CD-ROM [requires Flash].
   http://www.modelcad3d.com/

CADlib  
   A searchable online database of 2D and 3D AutoCAD and 3D Studio models, and portal to manufacturers web sites.
   http://www.cadlib.co.uk/

Trace Parts  
   Library of parametric components for 2D/3D CAD assemblies, which can be used with several CAD packages.
   http://www.traceparts.com/

Building Environments  
   Furniture and accessories in DXF/DWG/3DS/MAX format for use in 3D visualisations for free download for architects and interior designers.
   http://www.buildingenvironments.com/

CADParts  
   Produces library symbols and footprints for the Cadence CAD software.
   http://www.cadpartsusa.com/

3DSymbolSet  
   Sets of pre-drawn blocks and symbols for interior design in DWG and DXF format, which can be modified after insertion.
   http://www.3dsymbolset.com/

CatDas Inc.  
   Online 2D/3D parts library hosting, integrated with PTC Wildfire and the ability to do Parametric searches. Formats include PRT, DXF, IGES, DWG.
   http://www.catdas.com/