DivX for Mac offers the latest in world-class DivX movie playback and
encoding for your Macintosh computer. With an enhanced user interface,
significant performance improvements and the introduction of the DivX
Player this is the most powerful DivX for Mac, ever!

This is the final version run on PowerPC. This is a universal binary
and will run on both PPC and Intel Macintoshes.

Compatibility
Architecture: PPC x86 (Intel:Mac)

PPC and Intel, requires Mac OS X 10.4 or newer.

Note that although DIVX's Mac support is spotty, to say the least, you
may still need the browser plugin for in browser/on website videos.
This is something that alternatives, like Perian or VLC, don't cover.