OSNews points to a useful review on : Open source XML editors examined. “The eXtensible Markup Language (XML) provides a flexible and efficient way to store, transmit, and express data. The open source community has produced an impressive lineup of XML editing utilities. In this article Ryan Paul takes a look at some of the most useful.”
I’ve used several editors on the Windows platform, like XML and Stylus Studio, and I’m looking forward to trying out a couple of the products mentioned in the article, starting with Quanta.