Diff-visualizer is a project mainly written in JavaScript, it's free.
The Diff Visualizer generates visual representations of multiple consecutive diffs. Uses canvas.
Author: Mikael Roos
The Diff Visualizer generates visual representations of multiple consecutive diffs. Uses canvas. Does not currently work on IE. Simply generates a positive bar for number of added lines and a negative bar for number of removed lines. Also takes a label for each diff.
Copyright Mikael Roos, Nodeta Oy 2008