Loads of free e-books. Very nice.
OpenOffice is a worthy rival for Microsoft Office, and on top of that it comes with a built-in PDF filter. And best of all: It's free.
Wow. Now that's a lot of material! And the best -it's free.
Loads of downloads -sometimes a bit hard to use, though.
Now that's a lot of links!
A branch of the US Department of State's Bureau of Educational and Cultural Affairs
A first attempt at a site, started when I wasn't sure why I wanted one at all. Still, it turned out nice.