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User-Agent block
Block User-agents via PHP. Very handy in keeping out unwanted e-mail harvesting programs, programs that copy websites, etc. When a defined agent attempts to access a protected page, it will return a custom error message built within the script. It also sends an e-mail to an address you specify, detailing the attempted access.
URL: http://www.icehousedesigns.com/scripts/
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Cost: PHP 3/4, A Platforms: N/A Version: Free (GPL)