2. Php LuaThis extension embeds the lua interpreter and offers an OO-API to lua variables and functions.
3. YarLight, concurrent RPC framework for PHP & C
5. YaconfA PHP Persistent Configurations Container
7. YacA fast, lock-free, shared memory user data cache for PHP
8. TaintTaint is a PHP extension, used for detecting XSS codes
9. YafFast php framework written in c, built in php extension
13. mpassmulti-processes socket server for PHP