Not free but if you do a lot of text processing and want a power diff tool that even diffs CSV spreadsheets, for example, then Beyond Compare (https://www.scoot

Not free but if you do a lot of text processing and want a power diff tool that even diffs CSV spreadsheets, for example, then Beyond Compare (https://www.scootersoftware.com/home https://www.scootersoftware.com/home) is something I'd recommend. It is not the most expensive nor the cheapest. But it does do visual diff really well. There's a Windows, MacOS and Linux version too.