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File Comparison

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Anti-Twin is a small software application which compares files, i.e. it searches for duplicate or similar files on your hard disk drive.
http://www.anti-twin.com/
Absolutely free file comparison tool - FreeDiff by Salty Brine software. For windows 95/98/ME - windows 2000/NT/XP.
http://www.freediff.com/
Easily spot the differences in text and image files. Review changes in seconds with the world's most advanced Mac diff tool.
http://www.kaleidoscopeapp.com/