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Abyss Spy
This script monitors your downloads and sends an email when the script is accessed. Records IP, DNS address, referrer, time, browser and X_FORWARDED_FOR address (contains the real IP of a user trying to hide behind a proxy). Doesn't require SSI.
URL: http://www.multipleimage.com/chinthaka/abyss/
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Cost: Free Platforms: Unix Version: 1.4