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PHP Mini SQL Admin : Extremely lightweight alternative to heavy phpMyAdmin for quick and easy access MySQL databases.
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waybackpack : Waybackpack is a command-line tool that lets you download the entire Wayback Machine archive for a given URL.
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SoundManager 2 : Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API.
Nice write-up on techniques for scaling up a web application.