• Autodesk Design Review
  View, print, measure, mark up, and revise 2D and 3D designs without the original design creation software
  
  
  
• DWG from Autodesk
  Store and share design data when working with AutoCAD® software
  
  
  
• Active DWG
  http://www.activedwg.com/html/VBA.htm
  
  
• AutoCAD exchange (Dutch site)
  http://www.autocadexchange.com/
  
  
• CAD Depot - CAD shareware
  http://www.caddepot.com/
  
  
• CADfx - AutoCAD utilities, downloads and programming
  http://www.cadfx.com/
  
  
• CADopolis - CAD shareware downloads
  http://www.cadopolis.com/cadshareware.asp
  
  
• CAD symbols (good resource)
  Over 44 million downloadable symbols to download. Not for free.
  http://www.cadsymbols.com/
  
  
• cben.net - free AutoCAD symbols
  http://cben.net/
  
  
• Dotsoft - AutoCAD add-on utilities & free tools
  Tips and free stuff
  http://www.dotsoft.com/freestuff.htm
  
  
• Free CAD programmes
  http://www.freecad.com/
  
  
• Free CAD Apps (good resource)
  Large collection of CAD shareware, freeware and free trial software
  http://www.freecadapps.com/
  
  
• Free textures
  quite a few free quality textures (good resource)
  http://free-textures.got3d.com/index.html
  
  http://www.mayang.com/textures/ (good resource)
  http://www.akebulan.com/Free_Textures.html
  http://www.3dtotal.com/ (click on free stuff)
  http://www.3d-resources.com/3d_textures.php
  
  
• Hatch patterns
  http://www.autocadhatchpatterns.com/
  http://hatchpatterns.com/
  http://www.rockware.com/product/overview.php?id=68
  http://www.dotsoft.com/acadhatch.htm
  
  
• Kitox
  AutoCAD tools
  http://www.kitox.com/kitoxtools_en.php
  
  
• Learn CAD fast - free video tutorials
  http://www.learncadfast.com/autocad_tutorials.php
  
  
• Symbol Machine - CAD symbols
  http://www.symbolmachine.com/
  
  
• Upfront ezine
  Dynamic Block Mini e-book
  http://www.upfrontezine.com

Inventor downloads

• Autodesk Design Review
  View, print, measure, mark up, and revise 2D and 3D designs without the original design creation software
  
  
  
• Feature Recognition for Inventor
  Use this application to convert neutral 3D CAD (STEP, SAT, or IGES solids) models into fully featured Autodesk® Inventor™ models. Feature mapping can be executed automatically or interactively as needed to maintain design intent.
  http://labs.autodesk.com/utilities/feature_recognition/
  

• Autodesk Design Review
  View, print, measure, mark up, and revise 2D and 3D designs without the original design creation software
  
  
  
• DWG from Autodesk
  Store and share design data when working with AutoCAD® software
  
  
  
• 3D
  http://www.3dmodelsharing.com/
  
  
• Autodesk Store - free documentation (Revit book) from Autodesk
  If you have purchased Autodesk Software and received a free of charge Manual Order Card, you can order and receive free documentation.
  http://www.autodeskstore.com/home/store.pl
  
  
• Form Fonts
  A subscription service providing a professional low-poly 3D model stock for Revit.
  http://revit.formfonts.com/listCollections.php
  
  
• Google Sketchup
  SketchUp is a simple but powerful tool for quickly and easily creating, viewing and modifying your 3D ideas. So you can use 3D models from the online library Google 3D Warehouse in your Revit projects.
  http://sketchup.google.com/
  
  
• Renders
  - Accustudio: worldwide accurender resources (free downloads)
  http://www.accustudio.com/
  
  
• Revit Factory
  Sell Revit families, textures, work in popular demand
  http://revitfactory.com/
  
  
• Revit Family Man - Revit families to download
  http://www.revitfamilyman.com/new3revitfotwpage.htm
  
  
• RPC
  - Content
  www.archvision.com
  
  
• Symbol machine exchange (good resource)
  http://www.symbolmachine.com/Exchange.html
  
  
• Textures / images / Revit files
  
  Quite a few free quality textures (good resource)
  http://free-textures.got3d.com/index.html
  
  http://www.freeseamlesstextures.com/texture_tutorials/index.htm
  http://www.steelselect.com/
  http://www.imageafter.com/
  http://www.mayang.com/textures/
  http://www.animax.it/animax/frame1.html
  
  Contemporary interior stuff
  Free 2d and 3d files to download for free once registered
  http://www.e-interiors.net/
  
  
• Woodwork Institute
  http://www.wicnet.org/