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These games are similar to Realistic Star System Generator ...
Fronds of Benevolence   - Duke DeCorticus is dying!
SYZYGY - Ashcan Edition   - weird science fantasy roleplaying
The Electrum Archive - Issue 01   - A Science Fantasy RPG Zine
Meteor   - Corporate Sci-Fi Tabletop RPG
Outward Bound   - A game of space exploration, inter-species cooperation and weird anomalies, based on the Four Points RPG System.
PLANETAR Vol. I - Lazurith B2   - A planet for sci-fi TTRPG games.
Gravity RIP   - A sci-fi racing TTRPG
Pocket Planet Fantasy   - A planetary system generator for sci-fi TTRPGs
ANTI-SISYPHUS 1   - An occasional zine for your old-school role-playing needs.
T-DEF   - A GMless mini-zine game where you pit your troopers against alien invaders!
So You Want To Be An Adventurer?   - A simple fantasy version of What's So Cool About Outer Space?
ANTI-SISYPHUS 2   - The second issue of an occasional zine for your old-school role-playing needs.
Realistic Star System Generator is similar to...
Quest: Science Fiction Edition   - Quest RPG for hard science fiction and modern-world games
NONLOCALITY   - A 2-page hard sci-fi RPG designed by a physicist!
60 Years in Space   - An extremely crunchy d6-based hard sci-fi table top roleplaying game.
Federation HR   - A party game about the hardest working team in space
A Good Day to Roll Hard   - A Die Hard TTRPG
Voidfarers   - A Hard Sci-Fi Game about a Community Suriving an Authoritarian Space Regime
What's So Tempting About the Dark Side?   - a #WSCAJam game about jedi, sith, and the force.
Dying Hard on Hardlight Station   - Die Hard meets Alien in this thrilling escape from a hijacked station, made for the Mothership Sci-Fi Horror RPG.
PDS Paper Miniatures   - Printable Baroque Science Fantasy miniatures, for your tabletop games.
Mages and Mooks or Spellballs: Magic Hates You, A Role-playing Game of Dealing with It   - A boutique ttrpg of hard magic.
Let's Steal A Spaceship! and Way To Crash Genius!   - Small adventures for "What's So Cool About Outer Space?"
DISH PIT WITCHES   - work hard. play gay. do magic.
If you like Errant check out...
Barrow Keep: Den of Spies   - An old-school fantasy adventure zine of intrigue & romance
A Dragon Game   - A game about dragons and subterranean adventuring
Hack n Slash   - Pocket-sized Dungeon Crawler TTRPG
SOJOURN   - Adventures of Sword &  Sorcery in Dark Dungeons & Dangerous Lands
Heroes of Adventure   - Index of Heroes of Adventure releases and community forum
The Rot King's Sanctum   - An OSR-style  dungeon module  for levels 1-3
Lair of the Gobbler   - A dungeon for low Hit Die adventurers (1-2 HD)
Roseate Growth   - An OSR adventure of labor and lost gods
Inspirisles   - Groundbreaking RPG that teaches Sign Language! ASL and BSL included.
Trophies Of Violence   - An alternative system for death in A Dragon Game
Ancient Weapon Generator   - A free ancient weapon generator for fantasy rpg systems
Saffron   - DOOMCRAWL #1
If you like Omphalos check out...
Divined Journey   - A tarot-guided walk through the Hero's Journey and Virgin's Promise
Castle of Memories   - A solo-TTRPG about exploring a castle and finding lost memories
Anomaly   - A Game About A Supernatural Investigation
The Witch of The Westmoreland   - Tarot based Arthurian fantasy
You, and The House   - A solo journaling game about your new home, and those who dwell within it.
Chalice   - A game of Arthurian knights searching for the Holy Grail.
Tarot Telling For Two   - A Tarot-based RPG for Two Players
Hesitation at the Gate   - A Tarot based ttrpg
The Dying World   - Magic saves the multiverse!
Healer   - a solo journaling game about being a healer for hire
Hierophants   - A roleplaying game about religion, legacy, and leadership.
Astral Tourists   - Adventures in the Astral Plane
If you like OMENTIDE - for MÖRK BORG check out...
Awful Pets   - Pets for Mörk Borg
APOCALYPSE FRAME   - An Illuminated Mecha RPG.
The Triangular, for MÖRK BORG   - A transfixing, two-dimensional daemon-thief based on a Swedish children's song
Lichoma: Ashcan   - A Meatpunk TTRPG.
Mörk Borg - Word Dungeons   - Six word dungeons for Mörk Borg
Böwhoss’ handbook: notes on internal ignition - a field guide for MÖRK BORG   - A collection of memorabilia and near-death experiences
TORMENTOUS TRAGEDIES   - Twenty more troubling tales for MÖRK BORG.
THE ASH PEDDLER   - Bring ash and receive libations.
A Fistful of Creeps   - New old creeps for MÖRK BORG
Mörk Borg - Harpies Nest   - Mörk Borg - A short adventure and new creature
Armour Astir: Advent   - Revolutionary mechs and magic, powered by the apocalypse.
The Marrow Bees & Osteopiarists   - An encounter compatible with  MÖRK BORG.