There is a CVS version, but you have to compile that and it might not support the software you are trying to run. The paid-for version includes support for some copy protection schemes (not all unfortunately).
If you think paying for it is a problem, keep in mind that there are 80+ games that are supported at a 4 out of 5 or better (which means slight problems or annoyances), and that is the price of about 3/4 of the average games for 3-6 mos. worth of updates.
Not all software is free in Linux. I've bought 3 distros, 8+ native games, and WineX for my windoze games. If you add it up I've probably spent $350 or better on Linux stuff (not including hardware). If you don't like spending money,... you can always duel boot with windoze XPee... that is if you own a license...