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Free Kindle eBooks | Hard Science Fiction |

Showing Free eBook 1-30 of 275
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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 12 December 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 12 December 2019

Science Fiction & Fantasy, Hard Science Fiction

OTHER WORLDS: DIMENSIONAL CRASH (PARALLEL WORLDS Book 1)

Salinas Segura, Luis Alberto

...

Size: Unknown

Free from 12 December 2019

Science Fiction & Fantasy, Hard Science Fiction

Humanoid AI: More human than human?

Robert J Allen

...

Size: 169 pages

Free from 11 December 2019

Science Fiction & Fantasy, Hard Science Fiction

Emergent: Book 1 of the Cerenovo Series

Michael S. Nuckols

...

Size: 311 pages

Rating: 5.00 / 5
5 reviews

Free from 11 December 2019

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

Free from 11 December 2019

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

Loss of Signal: a novella

Daniel Fludgate

...

Size: 84 pages

Rating: 4.00 / 5
2 reviews

Free from 11 December 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 11 December 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 11 December 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: 4.10 / 5
4 reviews

Free from 11 December 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 10 December 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 09 December 2019

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

Star Game: Book 1, Ascension

F. P. Trotta

...

Size: 455 pages

Rating: 5.00 / 5
5 reviews

Free from 09 December 2019

Fiction, Science Fiction & Fantasy, Science Fiction, First Contact, Hard Science Fiction, 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 09 December 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 09 December 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 09 December 2019

Science Fiction & Fantasy, Hard Science Fiction

Fesarius: Starship Down

JOHN ADAMS

...

Size: 129 pages

Free from 09 December 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 09 December 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 09 December 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

Homo Avatarius: ( Your Consciousness is an Alien )

JT Alblood

What if whatever you know as HISTORY is just an illusion? What if your consciousness was an Alien?

Throughout the history of the world, we have seen war, the spread of civilization, discovered many wonders, but what if in all that time, Homo sapiens were merely evolving into ...

Size: 174 pages

Rating: 3.60 / 5
4 reviews

Free from 09 December 2019

Science Fiction & Fantasy, Fantasy, Fiction, Science Fiction, Alternative History, Hard Science Fiction

God's Ground: Compared to the settlement of space, all other forms of human endeavor shrink to insignificance

John Brophy

Tesla Miller has never been to space and doesn’t even like to fly. Desperate to save herself and her six-month-old son from her violent husband, she takes a job as an “escort” at the Sky City Resort and Casino in low-Earth orbit. Sky City is the newest and largest entry in the fledgl...

Size: 217 pages

Rating: 3.50 / 5
2 reviews

Free from 09 December 2019

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

RoboSuicide

Steven Orlowski

You're mostly human, implanted with technology to improve your life. If it works, awesome. If not, you'll have to trigger the RoboSuicide Sequence, a kind of self-destruct mode that'll convert you to 100% Artificial Intelligence. Your consciousness will be gone. But no one will be able to...

Size: 12 pages

Rating: 2.50 / 5
2 reviews

Free from 09 December 2019

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

Penticore Prime: The Tale of the Exodus

Mark Chevalier

Penticore Prime, a world where death is not bound by the laws of biology, and majestic towers rise into geosynchronous orbit. While far below, a colossal dome encloses a vast city landscape overflowing with light, color, and majestic architecture. Yet there is a reason why this ancient and...

Size: 363 pages

Rating: 4.60 / 5
3 reviews

Free from 09 December 2019

Fiction, Science Fiction & Fantasy, Science Fiction, Dystopian, Hard Science Fiction, Time Travel, Teen & Young Adult

Empire Ascensions (Exile Empire Book 2)

Joshua Done

...

Size: 376 pages

Rating: 4.70 / 5
11 reviews

Free from 09 December 2019

Science Fiction & Fantasy, Galactic Empire, Hard Science Fiction, Space Exploration, Teen & Young Adult

Beyond the Rubicon

John Peaseland

...

Size: 235 pages

Rating: 4.50 / 5
5 reviews

Free from 09 December 2019

Crime, Thriller & Mystery, Suspense, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction

The Liberty Fleet Trilogy (War of Alien Aggression, box set two)

A.D. Bloom

The Liberty Fleet Trilogy - After victory in the 2164-2165 War, Humanity expands into the territory of an Imperium that has sworn to destroy them. The first shots of the new war echo through the surrounding systems as Humanity's neighboring species must choose sides and fight with or again...

Size: 367 pages

Rating: 3.20 / 5
3 reviews

Free from 09 December 2019

Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Military, Space Opera

Interaction Region

Chuck Boeheim

Croxton had a reality distortion field a mile wide. When he persuaded his colleague, Howe, to tour neighboring universes to ensure their stability, Howe didn't know what he was getting into, until he started going home to different versions of his wife…A short science fiction story set a...

Size: 46 pages

Rating: 5.00 / 5
5 reviews

Free from 09 December 2019

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

Betta Virus: A Jadzia Banks Short Story (Kindle Single)

Jadzia Banks

It was old science, published back in 2011, but the implications intrigued her. Adira wasn’t as interested in eliminating fear as she was in generating it. What if instead of removing a healthy fear (like fear of a predator’s smell), a similar mechanism could be used to implant an unh...

Size: 24 pages

Rating: 4.40 / 5
4 reviews

Free from 09 December 2019

Fiction, Short Stories, Science Fiction & Fantasy, Science Fiction, Anthologies & Short Stories, Genetic Engineering, Hard Science Fiction, Post-Apocalyptic

Destiny of Hearts: A Dark Mafia Romance Story

Rachelle Mealove

...

Size: 36 pages

Free from 09 December 2019

Science Fiction & Fantasy, Hard Science Fiction

The Starship that Time forgot: A Captain Virginia Stoll Story

Edward Flynn

...

Size: 274 pages

Free from 08 December 2019

Science Fiction & Fantasy, Hard Science Fiction, Military

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