obfuscation - Obfuscate PHP code

Question

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Answer 1

I put together the following list a ways back - don't know if they are all current, or how many are now free, but you should find something useful here:

About:

1. Wikipedia article: PHP Accelerator
2. Comparison of APC, Zend, xCache, & the Zend Framework

Software:

1. Safeyar (Best)
2. PHP's APC (PECL page)
3. RoadSend
4. Turck-mmcache
5. eAccelerator
6. PHP-Accelerator
7. SourceGuardian
8. NuSphere Nu-coder
9. Gridinsoft
10. IonCube SA-Encoder.php

Another thread on SO that adds a few more (check it out):

Can I encrypt PHP source or compile it so others can't see it? and how?

1. Zend Guard
2. BCompiler (PECL page)
3. PHC