I\'m interested in an online application like the tool that comes with XCode, that shows the keys and values as rows, in an editable manner and handles xml plists (I don\'t care
There's Plistinator - its a native C++/Qt app for Mac, Windows and Linux desktop. So not an online tool, but it is at least portable and runs cross-platform (in case that is what the request for a web-based editor was about).
I'm not sure if the JS version handles binary files (Plistinator does). If you have a Mac you could edit them via the JS editor if you convert binary to XML via
plutil -convert xml myfile.plist
Note that will over-write myfile.plist with the XML version, which may not represent all the same information that the binary version can.
Full-disclosure: I am the author of Plistinator and the $12.99 goes to pay for my ramen & rent.