Currently Being ModeratedMar 17, 2013 8:31 AM (in response to Lucky78)
You can still get updated apps that were designed to work on your model PowerMac G5.
You can upgrade the OS X version to OS X Leopard 10.5.8
Apple now has a supply of these now. They are calling them retail replacement disc,
If you call Apple at 1-800-MY APPLE, and for for retail software sales, ask them if the have OS X 10.5 Leopard replacement discs for your Mac. You'll need your Macs serial number. These disc will cost less than $20 U.S..
As far as older software, instead of relying on the Mac App Store which, basically, has software only for Intel model Macs, now, look to online places like Amazon.com.
You can find newer versions of iLife that will still run on your PowerMac G5.
iLife '09 and iWork '09 are the last versions that work on PowerPC CPU Macs.
Find older, PowerPC compatible versions of Final Cut Pro/Express and Logic Pro/Express.
You will need to look for older Adobe versions on sites like Amazon.com, too!
The last version of the Adobe Creative of apps that will still run on PowerPC Macs is CS4.
For other software, if you actually go to the software developer's site, many still have older versions that you maybe able to still purchase and download or, if free, still have a section of their site where you can download the latest,compatible version. You do not need the Mac App Store.