These links are provided for information only. Your use of any of these software packages is at your own risk!
This is by no means a comprehensive list of useful software, but I use all the following packages on a more or less regular basis on my dual G4 MDD Power Mac in OS X 10.3.9, and have found them all functional and useful (in some cases I'm using older versions so some current versions may not be compatible with OS X 10.3.9). Check for compatibility with your particular Mac and system - most should have universal versions for Intel Macs - but you may find that some (such as MacJanitor) haven't been updated for some time. These include freeware, shareware, and commercial software.