As the support for old, PowerPC Macs drops every minute, finding the right software may become a time-consuming task. You can find the most important ones here!
Apple stopped releasing updates for Safari so you may find useful to get TenFourFox – a PowerPC clone of Fire Fox browser. It supports all important web development add-ons such as Web Developer Add-on for Firefox and Firebug Add-on for Firefox.
Get TenFourFox – a browser for PowerPC.