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StuffIt Deluxe 10.0 with serial number, runs on Mac OS X 10.3 and higher on PowerPC processors (i.e. G3, G4, G5).
StuffIt-Deluxe-10-0.zip (22.48 MiB / 23.57 MB)
Stuffit Deluxe v10.0 for PPC OSX / Zipped
Mac OS 10.3 - Mac OS 10.5
Note from @BingoRingo : Tested on Mac OS X 10.4, runs well.
Emulating this? It should run fine under: QEMU