facebook/xhp
"XHP is a PHP extension which augments the syntax of the language such that XML document fragments become valid PHP expressions."
Twig - The flexible, fast, and secure template language for PHP
"wig is a modern template language for PHP
* Fast: Twig compiles templates down to plain optimized PHP code. The overhead compared to regular PHP code was reduced to the very minimum.
* Secure: Twig has a sandbox mode to evaluate untrusted template code. This allows Twig to be used as a templating language for applications where users may modify the template design.
* Flexible: Twig is powered by a flexible lexer and parser. This allows the developer to define its own custom tags and filters, and create its own DSL. "rs's dml at master - GitHub
"Dailymotion Markup Language (or Dynamic Markup Language) is an XML compatible templating system.
XML tags with special namespace "dm" are used to inject some dynamic behavior into the code. Some tags are provided by default, but new tags can be easily added to extend the language. Finaly, the use of this template engine has no overhead, as it compiles templates as raw PHP code which can then be used standalone."
Install PHP-GTK 2 on MacOS X | PHP-GTK Community
the best feature of the installer is that you don't need X to run GTK+ apps, and the theme is by default Quartz-engine powered, which means you get the whole native Mac look.