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BNC Automatic RSS to Twitter (PHP Script) is the simple way to automatically publish any site that has RSS feeds to twitter including blogs and news sites.
BNC Mass Follow/Unfollow Script (PHP Script) is a simple way to manage all of your Twitter people in one place. With a simple click, you can follow or unfollow people, and these changes instantly update Twitter. The script costs $20.
TwitterOAuth is a very simple to use PHP library that enables PHP application developers to integrate Twitter within their apps.