After searching the web for some time, I haven't found a good comprehensive list of science fiction websites with free online books. So, I decided to make my own: below is the list of some very good collections of science fiction novels, short stories, ezines, and other sf related stuff. All ebooks are available for online reading and/or free download in various formats. Best Places to Download Free Science Fiction Books
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A Novel In Pieces by Catherynne M. Valente
Introducing the Baen Free Library by Eric Flint Baen Books is now making available — for free — a number of its titles in electronic format. We're calling it the Baen Free Library. Anyone who wishes can read these titles online — no conditions, no strings attached. (Later we may ask for an extremely simple, name & email only, registration. ) Or, if you prefer, you can download the books in one of several formats.