Diff parser and pretty html generator.
"Gow (Gnu On Windows) is the lightweight alternative to Cygwin. ... about 130 extremely useful open source UNIX applications compiled as native win32 binaries. It is designed to be as small as possible, about 10 MB."
You can compare two or three files and edit them in place (diffs update dynamically). You can compare two or three folders and launch file comparisons.