PHP script encoder and trialware creator with a graphical interface with several editions available. The website also offers a web-based free PHP encoder accessible through a free membership as well as support through a newsletter and forum. [Commercial]

Offers both a standalone download as well as an online service for encoding PHP scripts. Site features testimonials, commercial partners and support through request tickets and a forum. [Commercial, Free trial]

Renames variables, removes comments and white spaces from PHP files. Offered through Google Code with wiki information and known issues. [Open source, GPL]

Converts PHP source code into unreadable bytecodes for Windows, Linux and Mac OS X. Website also includes full documentation and free loaders for supported platforms. [Commercial, Free trial]

Obfuscation and encryption for PHP files. Offers customizable constants, Zend extension support and encrypted IP addresses and domain names. Website includes upgrade information, testimonials, and loaders for supported platforms. [Commercial, Demo available]

Commercial tool that obfuscates PHP source code, making it difficult to understand. Features a command line and visual interface. Website includes product news, other commercial services and additional software for a variety of languages. [Commercial, Trial version]

Formerly known as Zend Encoder, protects PHP applications for secure deployment without exposing the source code. Website details additional products, certifications and a developer zone. [Commercial]