I do know of a couple of PowerBuilder diff tools that are shareware. But are there any that are freeware or open source?
You might look at PBL Peeper. It had a Compare feature, in addition to a great deal of other capabilities:
http://techno-kitten.com/PBL_Peeper/Quick_Overview/quick_overview.html
Your version control system should include some kind of diff utility. There are different free ones available that should work if they support the SCC API.
If you want to look at diffs of PB objects outside of source control, you can export the object. PB exports have different filename extensions but they are are text files and you can then use any diff PB tool to compare items.
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