ArchiCAD’s rendering engine is Lightworks and, although it comes with some internal material libraries, it’s always nice to have more. Lightworks has therefore set up a website where users can download additional libraries - most of them free. Look for those that have “Base functionality” or “Architectural functionality” - the others may not work.
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Here is a freeware tool to create an unlimited number of seamless, high-resolution (or low-res if you like) textures and texture maps. It’s rather a steep learning curve but considering that there’s no cost attached, it’s well worth checking to see if it works for you.
Download: ~21 Megabytes
Go to: http://www.mapzoneeditor.com/

The links point to major collections of 3D objects that can be used by Archicad or Artlantis. This is a very good idea and I only wish I knew a little Spanish. Of course I view the site in English so it shouldn’t really matter but still; it’s more fun to read something in the [...]

This is a single archive containing about 2000 seamless jpeg textures. It contains the usual suspects - brick, wood, parquet, concrete, tile - as well as some unusual ones like crates, frontages, trim and ornamental details. You can have a look at the thumbnail pages before deciding if this huge collection is for you.
Warning! Filesize: [...]

For a site that’s been around almost two years, I would have thought there’d be more models to download but, well, it is a blog after all. Their models are in *.3ds format and there are 5 collections of textures as well.
Free 3d Models Collection by CGIndia

This site wants to be “For Everything AutoCAD”. Includes AutoCAD blocks (version 2006) tutorials, LISP routines, shx fonts and hatches. There’s also a forum for discussion and, possibly trouble-shooting. Time will tell if this site strikes a chord with users or if it’ll die away like many others before it.
http://www.cadcorner.ca/

This site has material texture libraries, a gallery of works and more than 600 3D objects in *.dwg format.
http://accustudio.com/

This is a collection of almost everything for the Cad user - SHX fonts, hatches, LISP routines and Blocks. There’s even an old collection of drivers in case you have some old equipment lying around.
« Not updated since 1999 »
http://www.cadresource.com/library/

64 free hatch patterns at this appropriately named site.
http://www.hatchpatterns.com/

You can get a massive 238 free hatch patterns [178 kilobytes]. They have a wonderful collection of routines too.