Patdiff is an OCaml implementation of Bram Cohen's patience diff algorithm,
with a few extra conveniences for comparing code and config files:

• outputs plain ASCII, ANSI color codes, or HTML

• optional semantic diffing of numbers (screenshot)

• good word-level diffing out of the box (screenshot)

And of course all the usual features:

• recursive diffing of directories

• extensively configurable output (markers, colors, location format, context)

• whitespace-aware diffing