This Czech site (don’t worry, the link is for the English page) contains some useful software, routines, patches and fonts for AutoDesk related products. New uploads have their date highlighted in red so even if you check it once in a couple of months, it’s easy to see what’s changed.
XANADU - CAD files and utilities

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

Although the report is quite US-centric, the suggestions here can be directly applied by anybody. Most of them don’t cost you anything - all you need, is to care a little for the environment.
Full Report :: 50 ways to save water