I want 3 cool games you think are crying out for some fan made content. If you're a game designer yourself, make the third game one of your own. I'll start:

Flabbergasted by The Wanderers Tome - I could easily see people creating pre-made societies, locations, or whole narrative arcs for this one.

Burn borough by Gwen Howard - This game is so cool and begging for 1000 zine sized adventures and expansions.

Tales From The Spectral Sea by Me - Even after setting the rule myself, I feel awkward doing self promo. But if people wanna write new locations or campaign arcs for my swashbuckling afterlife, I'd be thrilled beyond measure.

I'm looking for systems too! Here are a couple quick ones I found in my repository:

Squashbuckler by Richard Kelly https://kumada1.itch.io/squashbuckler

"You are a blade-wielding garden vegetable. Sworn to serve no lord and no country, you roam the earth seeking one goal: the defeat of all vampires."

Stonefruit by Cue Cazoo https://cuecuecazoo.itch.io/stonefruit-ttrpg 

This is a game about gender euphoria and hot fruit knights busting out of their armor. A bit SPICY, 18+.

Possibility Crisis by me https://titanomachyrpg.itch.io/possibility-crisis

This contains no mechanics, so it's more of a setting than a game, but I would LOVE to see system-agnostic adventures for my near-future fantasy project where only queer people can learn magic. It's open license, so you own & can sell whatever you make. Just give me a small credit!

Voldi's Punkhouse by me - https://johan2011.itch.io/voldipunkhouse

Jaldi's Sh*thouse by BaldiBall - https://gaminganthony123.itch.io/jaldis-shithouse

Baldi's Basics TUD by SeenWonderAlex - https://seenwonderalex.itch.io/baldis-basics-tud

Yazeba's Bed & Breakfast by Possum Creek Games - Making custom chapters would be a great way to engage with this amazing game!

Scurry! by Stout Stoat Press - This game has such a fun and exciting setting, and with three pre-made adventures already included in the game itself, there's a great format for making your own right there in the text!

Extra Ordinary by me - I'm probably going to make another Backdrop for this game as part of this jam just 'cause I can, but I'd love it if other people made their own Backdrops too!

Standing Ovation SRD - A simple high stakes system for solo games. I've done a couple of games in this, and will be creating a third for this. (I think We Will Not Go Quietly could do with some mods, tbh)

The Devil Jonah's Leviathan  - Very cool game with a very cool bespoke system. You could always grab the mechanics, but I think the setting itself is crying out for expansion and adventures.

Sinister Semester X is such an amazing survival horror mystery journaling game. I had so much fun getting into it for a week, that I made my own spin off of its system just so I could get more people to know Sinister Semester X exists at all!!