Game Planning forum? People who want to play free form games can see it there and brainstorm, and then start up some game applications. Sounds nicer to me than keeping a database on people who you'd have to search out and recruit for your games. Especially since people don't have to necessarily identify as "free form players" to want to play a free form game. I've enjoyed the several I played in before I ever tried rules-based systems, and I certainly wouldn't call myself a "free form player." But if I saw an ad, or an interest check, I might be inclined to join in.
The real nice thing about free form games is that they don't require the knowledge of any complicated established (and expensive) rules system. They are easy to get into: Any roleplayer is part of the potential audience. So I don't think you should have any trouble just making a thread like this "who wants to play freeform games?" in the game planning forum. Who knows, you might start a new trend and even get a new label for game threads.