Altova DiffDog is described as 'powerful, easy-to-use diff merge tool that lets you quickly compare, merge, and sync text or source code files, folders containing any file type, or entire directories' and is an app in the Development category. There are five alternatives to Altova DiffDog for Windows and Mac. The best alternative is Araxis Merge. It's not free, so if you're looking for a free alternative, you could try dbForge Data Compare for PostgreSQL. Other great apps like Altova DiffDog are ExamXML (Paid), XiMpLe (Free Personal) and BeyondXML (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.
dbForge Data Compare for PostgreSQL is a table data comparison and synchronization tool, which allows you to detect data differences in compared PostgreSQL tables, generate data synchronization script and execute it to eliminate all the differences.
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.
XiMpLe is an editor for XML files based on a grid table view and XML comparer as well. It can be used also for splitting large xml files and joining them back together or as a light text editor which supports bigger files.
BeyondXML is a 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.