SeaMonkey PPC unlike SeaMonkey is a working version of SeaMonkey running on PowerPC/PPC based Macs. Since 10.5.x is the last Mac OS X version to support the venerable PowerPC/PPC processor I will limit myself to the 10.5.x version of Mac OS X.
What's new in this version:
SeaMonkey for PPC incorporates Mozilla's latest changes and security patches.
SeaMonkey for PPC provides QuickDraw Plugin capability.