Eclipse

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There are plenty of editions of Eclipse to choose from

Aptana

Aptana∞ is the eclipse IDE with its own TV∞ channel full of training videos !

PHP IDE

The following must be downloaded and installed before the PHP IDE can be installed.
http://download.eclipse.org/tools/php/downloads/index.php?release=I20060911-023∞

YOXOS

The YOXOS eclipse packaging and download service is free of charge and the update service is available as a subscription.
http://yoxos.com/en.php/∞