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These games are similar to Oops! All Jokers! ...
The Glass Dream Game   - Belonging outside belonging. Building a utopia with action, thought, and games.
Caltrop Core v1.2   - An Introductory TTRPG Design SRD
Birds Love Dirt!   - Be a bird, play in the dirt, have fun
Four Sherlock Holmes and a Vampire (Who Is Also One of the Aforementioned Sherlock Holmes)   - A goofy RPG; as seen on The Adventure Zone: Elementary
Paradigm Adventures: The Pocket Roleplaying Game   - Streamlined, easy to use table top role playing game
Old Roads   - Oops, All Maps!
What We Give To Alien Gods   - An adventure module that explores thought, existence, and alien gods for the Mothership Sci-Fi Horror RPG.
when glamour dies.   - A Wretched & Alone game about the night that you thought will never go wrong, for 1-2 players.
A Response to the Esteemed Dr. Crackpot   - A game of academic squabbles for two or more players
SUTRA STORIES: A FATE CORE GAME   - the wheel turns, running you over
Sagas of the Icelanders   - Roleplaying in the saga age.
One Day at a Thyme   - A solo journaling game in which you play a cozy cottage witch.
Oops! All Jokers! is similar to...
Old Roads   - Oops, All Maps!
Only one page system RPG   - Oops! is a lightweight setting-agnostic RPG system
SUTRA STORIES: A FATE CORE GAME   - the wheel turns, running you over
when glamour dies.   - A Wretched & Alone game about the night that you thought will never go wrong, for 1-2 players.
The Detective   - A dinner party turns deadly & you must solve the mystery!
The SUS system, or the Super simple Universal System   - The simplest rpg system ever!
Skein   - A thought experiment about creating an inner Labyrinth.
2 Brave 2 Zenith   - A third party Brave Zenith supplement
This is a Tiny RPG   - A  minimalistic tabletop role playing system by Mat Rodgers
This is a Tiny RPG in Space V2   - A  minimalistic tabletop role playing system by Mat Rodgers
Sketchy Dungeons Cut & Paste Dungeon Art   - Dungeon Tile Art Sample
Ghost story? Maybe?   - I found this in my drafts and i don't recall writing it.
If you like White Box Paragons check out...
White Box Adventures   - A White Box FMAG adventure
#OSR Supplement - Minotaur Race, Adventure, and Maps   - Best with: AD&D 1st Edition and White Box FMAG
Down We Go   - A Rules Lite Old School Fantasy RPG
Hideous Daylight   - A pen-and-paper adventure module of sun-soaked horror. Compatible with Old-School Essentials and Cairn..
Destroy all Dungeons! Death to all Dragons!   - A game about rebellion, resistance, and revolution
d66 Starting Loadouts for Cairn   - Quick character equipment packages modeled on classic adventure tropes.
The Hunter Scholar - A Class for OSR Games   - Some hunt the monsters and undead for the knowledge and without the explicit divine powers of the gods.
Kismet   - How to effortlessly run your adventure modules with a single number
Oldham Rules   - Rules Light Freeform Tabletop Role-Playing System based on Old School Rules
Bearer, Channeler and Chanter - Classes for White Box: FMAG   - Three Custom Classes for use with White Box: Fantastic Medieval Adventure Game
Ulfire Tablets #1   - A sword, planet & sorcery roleplaying zine
Why Thieves are Anti-OSR, 3 Thieves That Aren't, & why we Love them Anyways   - Three OSR and D&D Compatible Thief Replacements
If you like Fair Winds and Following Seas check out...
Athanor   - A solo TTRPG about metamorphosis.
The Dreaded and the Deep   - A nautical terror Caltrop Core game.
Dredge   - A solo journaling game about sailing eldritch waters and pulling up odd items.
The Wildsea   - A tabletop RPG of sailing and discovery across a vibrant treetop sea
All Hands on Deck   - A storytelling game about a ship, its crew, and the sea they sail on
Phanta   - A rules-lite 2-6 player RPG about surviving after the destruction of earth
The Jewel of the Sea   - A Seafaring One Page RPG
SUBMERGED   - A solo journaling game about exploring the sea in search of the unknown
Deep Nightly Fathoms   - A game about exploring dark, dangerous dreamscapes
Voyage   - A mapmaking game about a journey at sea
Burning Hearts Forever   - Change fate with the power of your Heart
Example of Play, A Role-Playing Game.   - A short RPG for the sea to play.
If you like Troikasatsu Vol. 1 check out...
Slow Sleigh to Plankton Downs   - A journey to the glaciated world of Mora's Misstep
The Moon King Wants to Party   - Escort an insufferable noble through a decadent party.
LUMEN RYDER CORE   - a genre-agnostic, tokusatsu, monster-hunting, LUMEN game
Six Friendly Backgrounds for Troika!   - All original illustrations and backgrounds for Troika! Plus, a bonus quest generator.
A Forest God - A Troika! Background   - Play a strange, fickle god from a deep and mysterious forest realm.
Savage Tokusatsu: Kaiju, Mechs, and Heroes for Savage Worlds   - Transform into mahou, stop giant lizards, and kick space witches in the head!
Bakto's Terrifying Cuisine ULTRA - PREVIEW   - The world's greatest culinary adventure.
Oneironauts   - A surreal dream zine for Troika!
The Mirifique Factory   - The Spheres are infinite. So are our Spirits! TROIKA illustrated backgrounds
Hermit Knight Background for Troika!   - A crab who likes armor
crapland. splatter edition   - bizarro suburban-malaise inspired by years numbered 90
Troika Form-Fillable Character Sheet   - A form-fillable sheet that also includes rules references