What are some good free online science fiction books?

A great one is 'The Time Machine' by H.G. Wells. It's a classic that is often available for free. It takes you on a journey through time and makes you think about the future and the past.

Some great free online science fiction fantasy books include 'A Princess of Mars' by Edgar Rice Burroughs. It's a classic that introduced many elements that are now common in the genre. 'The Time Machine' by H.G. Wells is also excellent. It's a thought - provoking exploration of time travel and the future of humanity. And 'Frankenstein' by Mary Shelley, which can be considered an early work of science fiction, is available for free online and is a must - read for any science fiction or fantasy fan.

Well, 'A Wrinkle in Time' is a free popular science fiction. It takes readers on a journey through different dimensions with a young girl as the main character. It's full of imaginative ideas about space and time. Then there's 'I, Robot' by Isaac Asimov. This book introduced the famous Three Laws of Robotics which have influenced a lot of science fiction since. And 'Starship Troopers' by Robert A. Heinlein is also a good one. It has themes of military and space exploration.

There's 'A Canticle for Leibowitz' by Walter M. Miller Jr. This post - apocalyptic science fiction novel is available for free in audio on some platforms. It explores themes of religion, technology, and the cycle of civilization. And don't forget about 'Slaughterhouse - Five' by Kurt Vonnegut, which has elements of science fiction and can be found in free audio versions on various sources.

'To Kill a Mockingbird' by Harper Lee is often available for free online in some e - book libraries. It's a classic of realistic fiction that deals with important themes like racism and justice. Another one is 'The Catcher in the Rye' by J.D. Salinger. It gives a very realistic portrayal of a teenager's thoughts and feelings. You can also find 'Anne of Green Gables' by Lucy Maud Montgomery for free online sometimes. It's a heartwarming story about an orphan girl growing up.

One good one is 'Old Man's War' by John Scalzi. You can often find free excerpts of it online. It's about an old man who enlists in the military to fight in an interstellar war. Another is 'The Forever War' by Joe Haldeman. There are places on the web where you can access parts of it for free. It gives a very interesting view of war across vast distances of space and time.

Feedbooks can be considered reliable. It has a good reputation for providing free and high - quality e - books. Their selection of science fiction books is diverse, ranging from well - known authors to emerging talents. They also categorize the books neatly, so it's easy to find what you're interested in.

Yes, definitely. Project Gutenberg is very reliable. It's been around for a long time and has carefully curated a vast collection of books, many of which are science fiction. All the texts are properly digitized and are free to use.

Smashwords is a good one. It has a large number of self - published books, and many of them are fantasy fiction that can be downloaded for free. It also has a user - friendly interface.

One great source is "The Yellow Wallpaper" by Charlotte Perkins Gilman. It can be found for free on many e - book platforms. This short story is a classic in feminist literature and is a great example of adult short fiction. Another is "The Gift of the Magi" by O. Henry, which is widely available for free online. It's a heartwarming and thought - provoking short story.