Pariter is a light and very fast file-comparison tool based on Angus Johnson's excellent diff component.
The executable available for download is very outdated. It was compiled with Delphi 5 and only supports SBCS (single byte chartset).
There's a somewhat working port to FreePascal/Lazarus on bitbucket (still SBCS) and any help migrating the old CVS history and/or getting the project back into shape is welcome :)
Pariter's project page on SourceForge: https://sourceforge.net/p/pariter