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These games are similar to Radio Waves ...
The Wretched   - Survive alone in the black
Residents of Nowhere   - Factions for Liminal Horror to terrorize your weird road trip
Curse of the Alta Silva   - Can you survive the night?
Generational: A Story about Stories   - A world-building game of storytelling through the lives of historical and legendary characters.
Dead Air   - A Game about Radio Activity
The Lost Isle   - A mysterious island pointcrawl
Haxen   - A solo post-apocalypse RPG
Cairn [Edición en español]   - Explora un bosque sombrío y misterioso lleno de gente extraña, tesoros ocultos y monstruosidades indescriptibles.
Checkerbeak   - A supplement for MÖRK BORG created during the OSR Supplement Jam hosted by Taylor Lane in March 2022.
Monster Hunter   - A Solo Journaling Game in a weird west world.
One Page Left   - Create a Killer, Escape the Mansion
Gloom + Sanctuary   - Survive yesterday's apocalypse
Radio Waves is similar to...
Residents of Nowhere   - Factions for Liminal Horror to terrorize your weird road trip
Dead Air   - A Game about Radio Activity
Checkerbeak   - A supplement for MÖRK BORG created during the OSR Supplement Jam hosted by Taylor Lane in March 2022.
Tea for Two   - A game about talking, listening, and tea.
Gloom + Sanctuary   - Survive yesterday's apocalypse
Coded Comms   - System agnostic code based on real Amateur radio and Morse Code.
Depths   - Modo solitario para Exhume RPG
SRD -  Mark of the odd [es]   - SRD en español de la Mark of the odd
Fallen [Hoja de personaje]   - Hoja de personaje diseñada por Fran Vidal
Gesta orbital   - A Nano Solo RPG About Space Survival
24XX SRD   - Un SRD para crear juegos tipo Lo-Fi Sci-Fi
Firelights Kit de Creador y SRD   - Crea tu propio contenido basado en Firelights
If you like The Classroom Ready TTRPG Toolkit check out...
Carta SRD   - A Toolkit For Creating Single-player Exploration Games
Peregrine SRD   - A toolkit for creating card-based solo journaling games.
Monster Manifest   - 300+ Creatures from the SRD5 adapted for Quest RPG
MindExplorer   - A solo ttrpg inspired by 90s educational software
Lay On Hands SRD   - A System Reference Document for Lay On Hands
Tricksters   - A ttrpg of tricksters, lessons & desires.
The Sunless Seasons   - A weather toolkit for Blades in the Dark
Ironsworn: Delve   - A massive expansion and toolkit for the Ironsworn tabletop roleplaying game.
TTRPG Creator Resources Database   - This is a free a database of resources for TTRPG creators. Occasionally, donations accepted.
Tiny Library   - A deck of 50 single-card RPGs from dozens of different creators
Slayers Creator Kit   - A toolkit for making your own content for the Slayers RPG.
As the Crow Flies   - A corvid Carta game about exploration and making a home for yourself.
If you like Tiny Terrors check out...
What Crooked Roots: Folk Horror Encounters   - 15 Terrifying Roleplay Scenarios
FEVERPIT   - a tabletop miniature deathmatch game
Pilgrims Of The Nighted Path   - A Halloween Hexcrawl in South Louisiana
LOST EONS Land of Iron   - System-free point crawl through future Northampton
Revilo Bestiary for 5E   - A World of Monsters for 5E
Pocket Haunt   - A miniature haunted house
Evergreen Wilds   - Spend a season as a Park Ranger, exploring the Evergreen Wilds
The Knights of the Road   - A Tiny Role-Playing Game of High-Flying Adventure in a Monster-Infested 1920s
Tiny Home Terrarium   - A solo TTRPG about collecting rocks
Disk Masters: A Monster Battling/Collecting TTRPG   - Create Your Own Monster Today!
Hairic Minis - RPG Hero Pack 01   - A collection of Paper miniature for your RPG campains
Between the Margins   - A miniature Solo Journaling RPG
If you like Of Knights & Quests Revised Edition check out...
C A S S 1 N 1   - A space exploration game for 2-4 players
Unreality/Strictness -- The Single-Page Version   - A Six Elements Storytelling Game For 1-2 Players
Per Dolorem Silentio   - Gothic Science Fantasy Skirmish
Detail   - A worldbuilding game for 1-5 players
FEVERPIT   - a tabletop miniature deathmatch game
PDS Paper Miniatures   - Printable Baroque Science Fantasy miniatures, for your tabletop games.
Shepherds   - A JRPG-inspired tabletop RPG about doing the right thing
Storyteller   - a campfire narrative game
Domains Horror Roleplaying System Rulebook   - Narrative Horror TTRPG
Skirmish: Wallet Friendly Wargaming   - A wargame that uses things you already own for miniatures
Knight Astray   - A journaling game where you're a knight that has fallen from grace.
The Warp Army - Paper Minis   - A print-and-cut-and-fold-and-play paper army!