Free php encoder like zend guard or ioncube

Hi,
Is there any free php encoder that is similar to ioncube or Zendguard(too costly).
I know there is eAccelerator but could not find any way to encode the php code.
Turck MMCache used to have encode.php to generate binary code but unfortunately it is
no longer developed. I also tried Bcompiler but there is no .dll file for windows that support 5.3.5.
I am using xampp on windows 7/vista and my php version is 5.3.5.

Any help appreciated.

2 Questions:

  1. Will your project be distributed, or used solely for your own use?
  2. If yes, what sort of platforms will your clients be on (ioncube/zend are almost universally available, whereas most others are not).

Yes . I will distribute the xampp. Client os is vista/7. My os is 7. I am developing the php application in xampp
and after that I will copy it to client pc. It is free product for community but I want to hide my php code
so others cannot modify it. I can use linux to develop the product but it need to be run on windows as client os is windows.