4C Expanded Monstrous Compendium
James F Keck: 4C System 1 (2022 )
Keck Publishing: 4C System 1 (2022 )

4C Super Agents
Seraphim Guard: 4C System 1 (2008 PDF)

4C Super Teams Super Bases
Seraphim Guard: 4C System 1 (2008 PDF)

4C System: Weapons & Gear
Self-published: 4C System 1 (2008 PDF)

Ashcan Edition #1
Hazard Studio: 4C System 1 (2009 PDF)

Ashcan Edition #2: Unplugged
Hazard Studio: 4C System 1 (2009 PDF)

Ashcan Edition #3: Weird Science!
Hazard Studio: 4C System 1 (2009 PDF)

Ashcan Edition #4: All About the Fear
Hazard Studio: 4C System 1 (2009 PDF)

4C System
Self-published: 4C System 1 (2007 )

Guardian OmegaVerse
Dilly Green Bean Games: 4C System 1 (2007 PDF)

Heroic Moments #1: My Favorite Charity
Highmoon Games: 4C System 1 (2008 PDF)

Heroic Moments #2: Unregistered Mutant
Highmoon Games: 4C System 1 (2008 PDF)

Heroic Moments #3: St. Patrick's Day Parade
Highmoon Games: 4C System 1 (2008 PDF)

Heroic Moments #4: Easter Mayhem
Highmoon Games: 4C System 1 (2008 PDF)

Heroic Moments #5: SEPULCHRE Strikes
Highmoon Games: 4C System 1 (2008 PDF)

Heroic Moments #6: Dreams & Nightmares
Highmoon Games: 4C System 1 (2008 PDF)

Threat Record #1
Keck Publishing: 4C System 1 (2009 PDF)

Threat Record #2
Keck Publishing: 4C System 1 (2009 PDF)

The Villainous and the Vigilant 1
Self-published: 4C System 1 (2009 PDF)

World Metahuman Factbook Australia
Vigilance Press: 4C System 1 (2009 PDF)

World Metahuman Factbook Germany
Vigilance Press: 4C System 1 (2008 PDF)

Galactic Odyssey Game Master's Guide
James F Keck: 4C System 2 (2023 )
Keck Publishing: 4C System 2 (2023 )

Galactic Odyssey Player's Handbook
James F Keck: 4C System 2 (2023 )
Keck Publishing: 4C System 2 (2023 )