Parallel Fractal GPL 2.2.1 for Mac can be downloaded from our website for free. The software lies within Developer Tools, more precisely Debugging Tools. The actual developer of this free software for Mac is Dauger Research, Inc.
From the developer:
Parallel Fractal GPL is a numerically-intensive parallel graphics application that uses the MacMPI_XUB.c library for communications. The same source code compiles both in CodeWarrior, for creating Carbon CFM apps for OS 9 and X, and in Xcode, for creating a universal application on both Intel and PowerPC.
You may want to check out more Mac applications, such as Parallels Client, Parallels Virtualization SDK or Parallels 2X RDP, which might be related to Parallel Fractal GPL.