[sword-devel] Comparing Verses

[DM Smith]

When Chris Umphress included the link

http://kohl.wikimedia.org/~avar/gpl3/wdiff.html

regarding the differences between GPL v2 and v3 (proposed) it got me thinking:

"Is there any open source software that can be used to create a visually pleasant markup of the comparison of two verses?"

Does anyone know of any?

I don't care what language it is written in as it is the algorithm that is important.