Gentoo Linux
Although originally designed for the x86 architecture, it has been ported to many others and currently runs on the x86, x86-64, IA-64, PA-RISC; PowerPC, PowerPC 970, SPARC64, MIPS, DEC Alpha, System Z/s390, PS3 Cell Processor  and SuperH architectures. Official support for 32-bit Sparc hardware has been dropped.