*[PEGTL](https://github.com/ColinH/PEGTL) - The Parsing Expression Grammar Template Library, a C++11 parser library. [MIT]
*[PHP-CPP](https://github.com/CopernicaMarketingSoftware/PHP-CPP) - A library to build PHP extensions with C++. [Apache2] [website](http://www.php-cpp.com/)
*[Remote Call Framework](http://www.deltavsoft.com/) - Inter-process communication framework for C++. [GPL2/Commercial]
*[Scintilla](http://scintilla.org/) - A free source code editing component. [MIT]