DivX has released DivX 6.5 for Mac. The download is a Universal Binary which means it runs native in a PowerPC Mac and an Intel Mac. The download includes the DivX converter which costs $19.99 but comes with a free 15-day free trial. DivX for Mac also includes the DivX codec which allows you to convert movies via Quicktime's export (convert) feature. Furthermore, DivX for Mac includes a plugin that will allow you to watch DivX files in Quicktime. Last but not least, DivX for Mac will also include the DivX web players so you can watch DivX files via the web.
You can download it here. Just hit the Free Trial button. Your ability to play DivX files never costs anything. Only the DivX converter does so if you don't need it then don't buy it.