Pretty much those same tried and true programs. I've never tried KiTTY though. I also use WinMerge for file compare. I know there's the compare plugin for Notepad++ but WinMerge can do Word & Excel files too so I've just stuck with it. Also 7-Zip for compressed files.
This "85a06650bfe47bf4d0c0bf641c0c35b7"-code allows you to check if the download is matching the original file or not.
If it does not match, redownload or contact the file creator.