[Debian|http://www.debian.org/] is a free and open source system firstly released on August 1993. It supports several different architectures, including PowerPC 32-bit. A 64-bit-only PowerPC port is unofficially maintained and provides 98% of the source packages from the Debian 'stable' distribution compiled.
Debian -- PowerPC Port
http://www.debian.org/ports/powerpc/
* [Debian PPC64 Port|http://debian-ppc64.alioth.debian.org/] - ppc64 port home page
Debian URLs: http://tuxppc.rz.uni-augsburg.de/
* [Development Mailing List for ppc64 Port|http://lists.alioth.debian.org/mailman/listinfo/debian-ppc64-devel]
* [Debian on PowerPC|http://tuxppc.rz.uni-augsburg.de] - old site maintained by the University of Augsburg
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Another thing is the Debian LiveCD you could get from:
