Are you hoping to find Mathematica resources that are equivalent to WinMerge or Meld? You might start searching in the function repository
https://resources.wolframcloud.com/FunctionRepository
or in the built-in text/string functions
https://reference.wolfram.com/language/guide/TextAnalysis.html
If you have a specific challenge/objective and you want help implementing a solution with Mathematica, then just post details of your situation and we can help.
Otherwise, it feels a bit vague to say you're looking for something similar to something else.
