Water

Water takes a unified diff and opens it in your browser – nicely formatted.

• syntax colors (CodeRay)
• highlighting of in-line changes (“eye-catchers”)
• toggle files with a click

            git diff | water

svn diff -rPREV:HEAD | water

            diff -wu | water

…et cetera.

gem install water

This will install a latest version of CodeRay,
and launchy (along with its dependencies) for cross-platform browser opening.