I haven't heard of any of those free- genres. I always liked the idea of free-improv, but it's only the type of thing that should be attempted by extremely consummate musicians, I would imagine. I thought about starting a free-metal project once, but I can't imagine that I would be able to do it in a tasteful manner. Free-twee sounds like something I would never want to put my ears close to, but yet I do feel obliged to check it out for the factor of absurdity alone, if you care to drop any names.