The G5 processor is an antique. You'll find a lot of software that doesn't support it.
It can run up to Mac OS X 10.5.8 if you remove Mac OS 9 applications from pre-2001.
But that does mean:
1. It can't run the latest iTunes.
2. It can't connect to the latest iOS devices such as iPhones and iPads, though some earlier versions work fine with it:
3. It can't run anything exclusively written for Intel Macs or Mac OS X 10.6 or later.
4. The G5 is the last of the PowerPC (PPC) lineup.
When migrating to a newer Mac, you'll want to convert to newer application versions of documents:
You need to see whether the app supports 10.4.11 and it is either a Universal app or written to support the PPC.
There are lots of these apps around. Post another question here to ask about the app you are looking for.
TenFourFox -- It's a port of the latest FireFox to run on older hardware and software.
"World's most advanced web browser. Finely tuned for the Power PC."
-- works for me on 10.4. Supports 10.5
alternative download site:
Turn on pipelining. This will allow Firefox to make simaltaneous requests to the server. Chrome has pipeling turned on. Some sites could fail to load with pipeling set on. The site will be old. See "Increase pipelining" in:
OmniWeb uses the lastest Safari framework. The open source WebKit. Other browsers like Safari and iCab use the OS version of WebKit. The OmniWeb downloaded dmg includes it's own copy of the latest WebKit.
Safari 4.1.3 for Tiger
iCab - The Taxi for the Internet
What is my user agent?