You can download a trial copy of SourceGuardian or you can evaluate using our Online PHP Encoder. This will allow you to test our software without needing to download and install. Click here to test the Online Encoder.
"As I have already said this is the only product on the market able to decode files without extensions installation and it fitted in my dream "Encode Once, Run Everywhere". Another important factor, which makes Source Guardian very attractive, is its price. At 199 USD, the product is a bargain..."
PCHardware Review, http://www.pchardware.com/Articles/article.php?id=179&p=5