ILIKETRASH There is now a binary for OS X (see earlier comment). However, this program doesn't seem to recognize old-school Macintosh line endings, ASCII 13. I sent a note to the developer about this. (Version 0.9.91)
LOGICAT As of 5/16/06, you'll find the Mac binary of kdiff3-0.9.88 at http://sourceforge.net/project/showfiles.php?group_id=58666&package_id=54597&release_id=308098 (Version 0.9.90)