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 if it handles binary ones as well).
I don't think there are any plist editors online, at least not as functional as Plist Editor with Xcode.
You could use an online XML-editor, like Xmlia2.0, and code it yourself.
Why would you ever want an online tool for editing XML-files when you've got Plist Editor from xcode?
Any web app that accepts .txt
documents will edit plists just fine. Likewise for .xml
I wrote one once back in the day (for the old non-XML plist files). The structure is very regular, so it's not hard to create something that looks and acts more or less like the XCode plist editor.
I don't know off-hand of any online XML editors, but they must exist. Given a DTD-savvy XML editor, you ought to be able to edit plist files pretty easily.
I have resigned myself to the fact that there probably isn't one I will ever find. What I have found, however, is that JSON format and text PList format are very similar, and there are plenty of JSON editors available online and for windows and mac both. It may not be suitable for your needs, but it suited my needs just fine. By using nothing more than a couple of find & replaces in Notepad you can get 90% of the way to a plist file. The only big issue is semicolons vs. commas.
If you're working on a small enough file, that could be done manually. With larger files, a simple utility app to convert JSON to PList files would probably be pretty simple to whip up if you've got the urge.
Again, this all applies only to text formatted plist files. Most plist editors on mac at least can save a plist in text format.