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Free Kindle eBooks | Hard Science Fiction |

Showing Free eBook 1-30 of 249
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Paragon.EXE (Absolute Knowledge Book 0)

Drew Cordell

Paragon.EXE is the prequel novella to the Absolute Knowledge trilogy. Fueled by the Cold War, the development of the Absolute Knowledge project began with very different objectives than are present in the year 2146, over two hundred years in the future from the start of the Omniscient Proj...

Size: 39 pages

Rating: 4.00 / 5
4 reviews

Free from 14 October 2019

Fiction, Science Fiction & Fantasy, Science Fiction, Cyberpunk, Dystopian, Galactic Empire, Hard Science Fiction

Starship Doi - Wars

Alex Deva

...

Size: 262 pages

Rating: 5.00 / 5
1 review

Free from 14 October 2019

Science Fiction & Fantasy, Hard Science Fiction, Time Travel

Gil's World (Wanderers Book 1)

James Murdo

...

Size: 386 pages

Rating: 4.70 / 5
5 reviews

Free from 14 October 2019

Science Fiction & Fantasy, Science Fiction, Adventure, Alien Invasion, First Contact, Galactic Empire, Hard Science Fiction, Metaphysical & Visionary, Military, Space Exploration, Space Opera, Teen & Young Adult, Mysteries & Thrillers

Coefficient of Expansionism and Delta Stress at Pressure Naught: Two Science Fiction Tree, Flash Fictions

Brian Garrison

This title is actually two "flash fiction" stories. Neither is long enough to be considered a short story. Coefficient of Expansionism is a quest to settle the south pole, of the Moon. Delta Stress at Pressure Naught is an entrepreneur's adventure, to space and back....

Size: 19 pages

Rating: 4.50 / 5
2 reviews

Free from 14 October 2019

Fiction, Action & Adventure, Science Fiction & Fantasy, Science Fiction, Adventure, Colonisation, Hard Science Fiction, Teen & Young Adult

The New United States: Part 3 of The Raffle

Randy Smith

...

Size: 61 pages

Rating: 5.00 / 5
1 review

Free from 14 October 2019

Science Fiction & Fantasy, Dystopian, Hard Science Fiction, Post-Apocalyptic

The Algorithms: Prescience

Paul Tracy

...

Size: 459 pages

Free from 14 October 2019

Science Fiction & Fantasy, Hard Science Fiction, Time Travel

Expeditions of the Mantis: Mantis Saga: Book 2

Jim Henderson

...

Size: 213 pages

Rating: 3.20 / 5
3 reviews

Free from 13 October 2019

Science Fiction & Fantasy, Hard Science Fiction, Military

Far Mantis: Mantis Saga Book 3

Jim Henderson

...

Size: 285 pages

Free from 13 October 2019

Science Fiction & Fantasy, Hard Science Fiction, Military

Revenge (The Next Book 1)

Mike Miracle

...

Size: 129 pages

Free from 13 October 2019

Science Fiction & Fantasy, Hard Science Fiction

Kids...They Boot Up So Fast!: a preview of "The five year old man"

Debashish Chakraborty

...

Size: Unknown

Free from 13 October 2019

Science Fiction & Fantasy, Cyberpunk, Hard Science Fiction

DISRUPTIVE SHOCK: An EMP Survival story

Connor Mccoy

A yearly trek to the carnival with his young sons is the highlight of Ian Carrol’s life. What begins as another opportunity to build lifelong memories quickly fades to black by the time the sun sets. The world and humanity at large take an inexplicable turn, leaving the struggling single...

Size: 169 pages

Free from 13 October 2019

Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Post-Apocalyptic

Void Birds

Chuck Boeheim

...

Size: 38 pages

Free from 13 October 2019

Science Fiction & Fantasy, First Contact, Hard Science Fiction, Military

Edge of Reality (Phantom Server: Book #1) LitRPG series

Andrei Livadny

He is a cyber dweller. A gamer who's grown up in the web of virtual illusion woven from hundreds of phantom worlds. His biggest dream is to dump the real world for good.His desperate hunger of new experiences forces him to take a risk and become one of the first proud owners of a neuronet ...

Size: 383 pages

Rating: 3.70 / 5
4 reviews

Free from 13 October 2019

Science Fiction & Fantasy, Fantasy, Fiction, Science Fiction, Superhero, Cyberpunk, Hard Science Fiction

Fesarius: The Speed Trials

JOHN ADAMS

...

Size: Unknown

Rating: 5.00 / 5
3 reviews

Free from 13 October 2019

Science Fiction & Fantasy, Hard Science Fiction

OTHER WORLDS: DIMENSIONAL CRASH (PARALLEL WORLDS Book 1)

Salinas Segura, Luis Alberto

...

Size: Unknown

Free from 13 October 2019

Science Fiction & Fantasy, Hard Science Fiction

Humanoid AI: More human than human?

Robert J Allen

...

Size: 169 pages

Free from 12 October 2019

Science Fiction & Fantasy, Hard Science Fiction

The Exile Empire

Joshua Done

Live. Run. The last message from Central Command was more a plea than an order, and running is exactly what the last remnants of humanity did to escape The Death as Earth was destroyed. Among the survivors is James Ursidae, a fearsome warrior whose despair now outweighs his expectations fo...

Size: Unknown

Rating: 4.40 / 5
37 reviews

Free from 12 October 2019

Fiction, Action & Adventure, Science Fiction & Fantasy, Science Fiction, Adventure, Hard Science Fiction, Teen & Young Adult

Emergent: Book 1 of the Cerenovo Series

Michael S. Nuckols

...

Size: 311 pages

Rating: 5.00 / 5
5 reviews

Free from 12 October 2019

Crime, Thriller & Mystery, Thrillers, Fiction, Science Fiction & Fantasy, Science Fiction, Cyberpunk, Dystopian, Genetic Engineering, Hard Science Fiction

Loss of Signal: a novella

Daniel Fludgate

...

Size: 84 pages

Rating: 4.00 / 5
2 reviews

Free from 12 October 2019

Science Fiction & Fantasy, Hard Science Fiction

Paradox - On the Brink of Eternity

Phillip P. Peterson

...

Size: 448 pages

Rating: 3.60 / 5
18 reviews

Free from 12 October 2019

Crime, Thriller & Mystery, Thrillers, Fiction, Science Fiction & Fantasy, Science Fiction, First Contact, Hard Science Fiction, Space Exploration

Year’s Best & Big Science Fiction Book: Fantastic Science Fiction Stories Collection

Teddy Boles

This gathering propelled the prominent and long-running "The Year's Best Science Fiction" stories Fabulous Science Fiction! The Year's Best - And Biggest Collection...

Size: 105 pages

Rating: 1.00 / 5
1 review

Free from 12 October 2019

Fiction, Short Stories, Science Fiction & Fantasy, Science Fiction, Anthologies & Short Stories, Hard Science Fiction

Loss Of Reason: A Thriller (State Of Reason Mystery, Book 1)

Miles A. Maxwell

One Of The Most Disturbing Stories You'll Ever Read

Distant for many years, Franklin out of Pennsylvania and his step-brother Everon out of Nevada are connected by a single link: Their sister Cynthia.

Enter The Nightmare

A nuclear bomb is detonated in...

Size: 288 pages

Rating: 4.20 / 5
4 reviews

Free from 12 October 2019

Crime, Thriller & Mystery, Mystery, Thrillers, Suspense, Science Fiction & Fantasy, Fantasy, Epic, Historical, Fiction, Action & Adventure, Nonfiction, Romance, Science Fiction, Hard Science Fiction, Post-Apocalyptic

The Sphere: A Short Story by John Newcomb Crain

John Newcomb Crain

...

Size: 21 pages

Free from 11 October 2019

Science Fiction & Fantasy, Science Fiction, First Contact, Hard Science Fiction

Rika Outcast: A Tale of Mercenaries, Cyborgs, and Mechanized Infantry (Aeon 14: Rika's Marauders Book 1)

M. D. Cooper

In the Age of the Orion War...Rika is mech-meat, a cyborg killing machine, created by the Genevian military and cast aside when the war was lost.Now she slings cargo on Dekar Station, falling deeper in debt as she struggles to make enough money to keep her cybernetic body functioning. The ...

Size: 249 pages

Rating: 4.90 / 5
19 reviews

Free from 10 October 2019

Fiction, Science Fiction & Fantasy, Science Fiction, Cyberpunk, Galactic Empire, Hard Science Fiction, Military, Space Opera

Plague of Equals: A science thriller of international disease, politics and drug discovery. (Pandemic Mysteries Book 2)

J Oestreicher

In cities and villages world-wide, drug companies must defend their clinical trials against anti-science activists. Eleanor Powell is convinced the drug companies have done their due diligence, but the global population is shrinking and politicians are looking for a scapegoat. Eleanor is f...

Size: 410 pages

Rating: 4.00 / 5
13 reviews

Free from 10 October 2019

Crime, Thriller & Mystery, Thrillers, Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Teen & Young Adult

Lucian 00000001

Ray Fisher

Lucian 00000001 was an android with a problem. He hated his creator, Jackson. After breaking Jackson’s arms he was placed in a prison, Terra, with other faulty androids. Lucian became the tyrannical ruler of Terra forcing his master to design another android, Joshua, to restore peace the...

Size: 205 pages

Rating: 5.00 / 5
1 review

Free from 10 October 2019

Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Metaphysical & Visionary

First Comes Chaos (The Rexan Discovery Book 1)

Samantha Harmer

...

Size: 316 pages

Rating: 5.00 / 5
1 review

Free from 10 October 2019

Science Fiction & Fantasy, Hard Science Fiction

Fesarius: Starship Down

JOHN ADAMS

...

Size: 129 pages

Free from 10 October 2019

Science Fiction & Fantasy, Hard Science Fiction, Space Exploration

Porcupine Station (The Golden Age of Heroes Book 7)

Ken Ramsley

David Evangelista is trapped in Alaska trying to figure out what happens next. At the hands of a natural disaster of unimaginable power, humanity has been nearly wiped out. The rest of his research team is stuck in the lower 48, and David is on his own. Daylight has disappeared, at leas...

Size: 103 pages

Rating: 5.00 / 5
2 reviews

Free from 10 October 2019

Fiction, Action & Adventure, Literary Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Post-Apocalyptic

Nadine's Bible (Book 1): Old Testament (AfroFuturism Sci-Fi) (Alien Monologues' series)

T Lindsey-Billingsley

Book One (2nd Edition;Alternate Cover) There's a popular saying that men are from Mars and women are from Venus. In this science fiction story, nothing is closer to the truth. The Great Mother created the perfect woman in Her image on Venus, and the Great Father created a perfect man in Hi...

Size: 204 pages

Rating: 4.00 / 5
1 review

Free from 10 October 2019

Crime, Thriller & Mystery, Thrillers, Science Fiction & Fantasy, Fantasy, Epic, Fiction, Science Fiction, Fairy Tales, Alien Invasion, Colonisation, Cyberpunk, First Contact, Hard Science Fiction, Metaphysical & Visionary, Space Exploration, Space Opera, Time Travel, Teen & Young Adult

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