The HipHop Virtual Machine (HHVM) is an alternative PHP runtime implementation. It executes scripts JIT-compiled for higher performance, but retains most dynamic features, weak typing, and scripting language capabilities. While its companion language "Hack" constraints some features for additional execution speed. HHVM is developed and used by Facebook, where it achieved significant performance gains and reduced memory consumptiom. Its syntax and standard library feature set is meanwhile compat
PhpWiki is one of the earliest WikiWikiWeb clones implemented in PHP. Wikis are used for collaborative and per default authorization-less editing and provide a natural markup for structuring and easy hyperlinking. PhpWiki requires little initial configuration, comes with plugins and many built-in page extensions, and is fully gettext-internationalized.
Watson is a Python web application framework. It's unobtrusive and follows convention over configuration.