Looking for a Free-Form game.
I've never done true free-form, though my style is generally story/character based rather than gamist*.
I wouldn't mind doing an experiment, using my sytem in the background out of sight of the player.
In theory, it should seem freeform to you, you wouldn't see any mechanics ever, yet it still would provide consistency to the world and an objective resolution on my side. (I would consider it the ultimate test of the system, for a character/world focused style of play anyway)
Of course, I lack familiarity with freeform so I'm not entirely sure if consistancy is antithetical or not, and of course whether a gm is even relied on for deciding success/failure/complication/whatever would come from player actions, particularly things like combat or contests of skill.
I have a rather original world in need of exploring if you think it might be workable.
* Most players I've talked to that dislike system games, dislike them because of the gamist style play, where players make choices based on mechanics then make a story reason for why their character made that choice, or because the other players make the story and their characters take backseat to the mechanics, or as some players tend to play gimmicks rather than characters. All of which are things I also dislike, though I don't blame the presence of a system for those things.