http://atmosphir.com/Free platform game creator- it's very simple and still slightly buggy, but interesting for what it is and admirable for what it's trying to be. Plus, y'know, can't beat the price. Just got my beta invite tonight and I've played a couple of the levels that are up there and toyed around with the editor a bit. As a veteran of Games Factory, Timesplitters, RPG Maker and Garry's Mod, and an avid follower of Little Big Planet thus far (haven't quite sprung for a PS3 yet), this isn't blowing me away as far as game creator/level editor. It's very simplistic, but I think the biggest asset it has going for it right now though -is- that simplicity. This is startlingly powerful in ratio to how easy it is to pick up and use. It looks like they're laying a pretty good groundwork to add to it and create a community around it going forward, and I'm excited to see if anything comes of it.