Like Batsphinx said anybody can try them out; just head over to the official website then navigate to the forums and follow the installation directions. Just keep in mind that the versions on the forums are buggy. I've made quite a bit of progress then lost it all on a couple occasions because of a crash, bug, etc. So if you don't get super frustrated and are okay with that then go for it, its neat to see how its progressing along.
Freelancerjw
Joshua joined
Hey, just an average guy who enjoys supporting independent developers in achieving their goals and loves playing games.