Vasper released today BeOS Max Edition v3.0. The compressed file weighs about 280 MB and includes third party software in addition to the tweaked core of BeOS 5.0.3 PE. BeOS Max is patched and supports AthlonXPs/Pentium 4s and installs on its own partition. Burning the ISO is not as simple though, as it has to be burned as BFS ISO format. More info on how to properly burn it here and here.