Although I have a love-hate relationship with the place due to an annoying combination of brilliance and shoddiness, don't overlook Lulu.com. They now sell ebooks in the current sense, but still have many PDFs available. Now, there is the option to apply DRM, but not all author / publishers take it so there will be many many downloads of different formats without it. Take a look, there is (although I don't know how after ruining the site in some important ways) a great deal of diverse material on there, and I am sure anyone looking for non DRM content will find something that would interest them.
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