Sage is an organization helping impactful communities figure out what's true.
We've made AI Digest, Fatebook, and Quantified Intuitions.
https://peterattiamd.com/confidence/ - The only numeric calibration test that I know of (asks you to provide a "95% confidence interval)!! :) However, you'll need to grade it yourself :(
Thanks! There's a Manifold Markets Discord bot which lets you quickly create and bet on markets
We might create a Fatebook Discord bot if there's enough interest (some other people have asked for it) - though first we're making a web version.
See also Confido and Fatebook