Going to collect some ideas in one place.  Feel free to throw in your own 🙂

Current or Available

Unnamed Island
 Robbie's current Wed

Space.. TOO!!
 open-world campaign available for one-shots at player request.  Quests varied to include a variety of RPG styles to suit the requesting group.

Sleep Project
  available horror/comedy one-shot

Active Development

Dodgeball 
 this one would most easily play out like a Beyond the Supernatural or White Wolf Hunter campaign.  The PCs would be members of a professional dodgeball team, unexpectedly pulled into the hidden world of the monstrous.  Winning the ADAA is clutch, but so is checking out the supernatural and maintaining the mask.  Dodge (+Av cap Perc), Duck (stance +Av -speed), Dip (ready action to Catch), Dive (standard action stacking +Av/San), AndDodge! (stacking +Av half-ranks).
 time period could vary.  anything from anachronistically inconsistent archer-style, to cyber-punk almost-rifts (no lasers or particle beams yet, but other standard rifts tech is the current cutting edge)

Fantasy Tweaked
 originally designed as a Dark Sun world (although likely in a heavily reimagined format focusing on the flavor, not the specifics).  total new map, limited races of which folks must be one, would present a very good chance for group world building.  magic might work weird, not wild, but more caveats than normal.  additional dimensional aspects.  at this point i've leaned less into that aspect of dark sun, but it could add a new flavor to the gumbo almost at the level of the hivemind.  optional variant only.
 long story short i can spit out fully functional fantasy worlds with full geological and anthropological roots pretty fast these days.  these can lean a lot of ways in terms of type of campaign, since the map is just the canvas.

Rennaissance
  would stand out the most for being a Rennaissance time period rather than stone/middle ages. setting would be Randworld, leaning into events a couple hundred years after the utopia at the end of the WoT books.  not heavy on fanfic, just ease of having prebuilt real history for non-readers.  definite limits on the magic system but pretty straightforward ones, elemental caps and specializations, lots of counterspelling and disabling other casters.  could lean a lot of ways in terms of type of campaign.

Undeveloped

We Shrunk The PCs
 this one has come up several times recently in different context.  Undeveloped, the basic idea is fighting through the challenges of being an inch tall in your own backyard.  I envision this unfolding as a humorous dungeon crawl, and likely only lasting a short time period

"Mob" Suggestion
 a couple players insisted that this had come up a couple times, and so therefore added to the list