Here, you’ll find an ever-increasing collection of science fiction and fantasy literature currently in the public domain, or available for free online somewhere in the nebulous ether we know as cyberspace.
I’d also like to point you toward the Baen Free Library, a collection of novels from authors at the Baen imprint. Many of these are first novels in a series, and the collection rotates. And there’s also the Science Fiction collection at ManyBooks. Plus, the folks at GoodReads has also collected several titles as well. And there’s also a good set at Lightspeed Magazine.
We’ll keep adding to the list as we can. In the meantime, download and enjoy!