- HipHop PHP (from facebook)
- Phalanger http://
www.php-compiler.net (better compatility) - http://www.phpcompiler.org
- http://www.roadsend.com/home/index.php?pageID=compiler
- http://www.bambalam.se/bamcompile/
- http://sourceforge.net/projects/binaryphp/
- http://phalanger.codeplex.com/