I have rewritten my differencing application to be cross platform. I have rebranded it to xdiffr and I have made it open source. You can download built Windows and Linux executables here:
https://adamk.org/xdiffr
The source code is hosted on github:
https://github.com/adamkorg/xdiffr
You are more than welcome to download and play around with the source code. I will try to merge in any contributed changes that have broad appeal.
Information about the old Windows only application can still be found here:
https://adamk.org/xdiff