I'm still figuring out what I want to to list here but as I'm reading this topic. I noticed that the following hacks exist:
The Quiet Year has a hack called Looming. There's a podcast by the designer playing it: Atlas of the UNknown World. It combines Quiet Year, Spindlewheel, and darker outcomes.
For Psi*Run, I made one very recently called No Crime But Living: Fleeing Facist Wizards in a Modern Magical Society. It's pretty dark because it's supposed to be about the experience of disenfranchised people and also still under construction but I think it has potential.