Dr John Freeman
@scifiguy.bsky.social
Hopeless ball of stress - writes booklets to help authors, gamers, GMs, and other creatives with the space and technology details of their projects, when they need that. 'Cos I went and got a PhD in engineering and physics, and I like helping people.
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 14, 2025 at 2:40 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 14, 2025 at 2:40 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 14, 2025 at 2:39 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 12, 2025 at 12:04 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 12, 2025 at 12:04 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 12, 2025 at 12:03 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 12, 2025 at 12:03 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#autho #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 9, 2025 at 10:54 PM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 9, 2025 at 10:54 PM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 9, 2025 at 10:53 PM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Hard SF Worldbuilding Cookbooks: The Campfire and Ember, a Binary Star System - John Freeman | DriveThruRPG
Hard S.F. Worldbuilding Cookbook #4.9: The Campfire and Ember, a binary star system
A how-to guide for writers and roleplayers
Start with your story. Choose locations, situations, and useful prompts...
www.drivethrurpg.com
December 9, 2025 at 1:19 AM
The Hard SF Worldbuilding Cookbooks
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo
Are you sci-fi worldbuilding? From nova to alien rainbows, this series offers visuals, details & prompts. Write - have the science as needed.
Inspiration, then #worldbuilding
$PWYW
www.drivethrurpg.com/en/product/5...
#author #ttrpg #shamelessselfpromo