BeyondXML is described as 'revolutionary innovative XML editor that offers a host of new and highly useful features currently unavailable in other XML editors, making it the most powerful XML editor on the market' and is an app in the Development category. There are three alternatives to BeyondXML for Windows and Mac. The best alternative is Araxis Merge. Other great apps like BeyondXML are ExamXML (Paid) and Altova DiffDog (Paid).
Merge is the visual file comparison (diff), merging and folder synchronization application from Araxis. Use it to compare and merge source code, web pages, XML and other text files with native application performance.
ExamXML displays XML documents in a tree view, highlighting differences down to the level of elements, words or attributes, so that you can view exactly which attributes and elements have been added, modified or deleted.