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Guardian
Handles server errors easily. Attempts to solve the site error or can present a friendly, customizable error message which can be logged or emailed to the site administrator. Works with most web servers that allow custom error pages, including Apache 1.1+ and Microsoft IIS 4.0+.
URL: http://www.xav.com/scripts/guardian/
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Cost: Free/$20 Platforms: Unix/Windows Version: 2.0