GammaFinder is a post-apocalypse setting for the Starfinder Roleplaying Game. I have multiple articles that begin to describe and define GammaFinder, and this is the index to all of them.

CORE RULES AND SETTING
The basics.

GammaFinder Rules. Simple rules for post-apocalypse gaming using Starfinder, along with just the hint of a setting *mostly to justify calling it ‘GammaFinder.’)

The Unburned World. A larger article that includes a quick description of the pre-apocalypse Unburned World, and the Chasm of History that separates it from the modern era.

Titans. Halfway between landmarks and gods, no one is sure where these motionless giants come from, or what their purpose is. But they have a real, if subtle, effect on the world around them.

PLAYER OPTIONS
Beyond the core rules, here are the things players can use.

Mega-Heroic Moments
You just get one, but when you use it, it’ll be memorable.

Themes
Alphite. You were raised in the domed city of Apha, before it was destroyed.
Brain-In-A-Jar and Murderous Toy. These stretch what themes are supposed to do to their limits, to give weirder character options.
Mutie. You are a mutant, and your mutations are evolving.

Archetypes
Mutamorph. Exposed to the strange energies of the World of GammaFinder, your body is morphing into… something.

Class Options
Mutant Soldier. Options for soldiers to gain mutations as class features.

Mutations
Gaining Mutant Abilities. All the options for PCs to gain mutant abilities and tiered mutations, all in one post!
Advancing Mutations. In GammaFinder, sometimes YOU get weirder and weirder.
Mutations for Starting Characters. You were just born that way.
Tiered Mutations (teleportation). The rules for tiered mutations that grow in power as you focus on them, with the psychoportation tiered mutation as an example.
Danger Sense. It’s tingling! A tiered mutation.
Elasticity. Yep, it’s stretching powers. A tiered mutation.
Entangle. Slow them down, wrap them up. A tiered mutation.
ESP. Telepathy and psychic projection. A tiered mutation.
Genetic Sorcery. The power to create magic is in your DNA. A tiered mutation.
Healing Factor. A tiered mutation.
Incorporeality. A tiered mutation.
Invisibility. A tiered mutation.
Luck Manipulation. A tiered mutation.
Ranged Attack. A tiered mutation. For attacking things. At range.
Summoning. A tiered mutation.
Super-Strength. A tiered mutation. (Scroll down a bit for the mutation)
Weather Control. A tiered mutation.

Junk Magic
Two spells – junk gizmo and junk HUD.

GM TOOLS
Beyond the core rules, these are things the GM can use to help built the setting and its feel.

Hazardous Junk
The Starfinder RPG has lots of spells that use junk as an element of the casting. But what if that junk is hazardous materials?

Halidoms.
Weird relics of the Unburned World, from before the Chasm of History. Presented conceptually in Part One, and rules for PCs trying to figure them out in Part Two.

Survival.
Survival is a key theme of post-apocalypse rpgs. Starfinder has a “Survival” skill. Making skill checks to survive every day is boring, and no one wants their game to end because everyone starved to death. And tents, even high-tech tents, tend not to actually make a difference to PC’s health and happiness.
These rules fix all those issues and brings them together.

MUTANTIARY
These entries are like a bestiary, but for weird mutant threats!

Hammerderm It’s a dangerous sonic shark-rhino mutant.

BOOMER EXTRAS
The spectacularly creative Clinton Boomer has done some additional material for GammaFinder, and we’re thrilled to link it here for folks who want Moar Weird!

Dhampir of the Gamma Wastes. Yep, post-apocalypse vampires.

Fist of the Gamma Star. Ready for Post-Apocalypse Martial Arts?

Footprints in the Burning Wasteland. Each blasphemous caress of your sorcery is, of course, a unique & terrible thing.

The Halidom City of Rho. It drifts along, some seven & a half miles above the scarred, broken wasteland stretched-out far beneath it, pushing effortlessly against the hellish winds of ash, glass, and the blood-thick dust of Empires.
An awesome setup for a whole campaign, or the most random of random encounters.

Omegamancy. Even after the world ends, some things are forbidden.

Reek of Corrupted Wasteland. You can smell what the Omegamancers are cooking!

WANT MORE GAMMAFINDER?!
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Thanks, everyone.