I was introduced to mises.org last night. It looks to be an interesting site, with tons of information. The subject matter is the Austrian School of Economics. Can’t believe I wasn’t already aware of this site’s existence. Okay, I can. But I was still a bit surprised.
They have a wonderful collection of books in many formats (purchase, pdf, epub, etc), and a ton are good if you are on a budget (they are free). For language learners, there is quite a bit of non-English material here, too. I grabbed a couple books in German, but also saw some in Spanish.