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Excluding files and folders from a comparison
You can specify wildcard expressions to exclude files and folders from the folder comparison. Files and folders that are excluded in this way will not be compared and will not appear in the results list even when you choose the Show Hidden Items menu item. You can use this feature to exclude large binary files or entire folder hierarchies from the comparison.
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Launching file comparisons
The results list can be used to launch file comparison windows for selected rows of files. Please see the Launching File Comparisons topic for more information.
Beyond Compare
Originally a product for Microsoft Windows, the Beyond Compare team has contributed a fine diff tool to the Mac platform. Like Araxis Merge and DeltaWalker, it goes beyond (pun intended) comparing simple text and also allows diffing Word and PDF contents. In its “Pro Version”, it also supports merging.

Integrations
Another aspect to watch out for is integrations: before choosing your favorite tool, you should make sure that it plays nicely with the rest of your tool chain. I can already confirm that all of the mentioned tools work seamlessly at least with Tower, our own Git client.
If you don’t need the power of a dedicated Diff tool application, the integrated diff views in Tower might be absolutely sufficient for you:


In case you don’t know Tower: it’s the Git desktop client for Mac and Windows that helps thousands of developers and designers to easily & productively work with the Git version control system. Try it 30 days for free!