PHP is an open-source scripting code-- it allows you to post all manner of files to the web for others to use. It should be possible to convert it-- but in conversions from 1 format to another ... there can be some loss of quality.
There is a whole world full of free stuff at sourceforge and others.
SourceForge.net: Welcome to SourceForge.net
All open source-- which means that anyone who knows how to 'code' software can make their own contributions to a program's development. Linux is an example-- there are hundreds of versions... maybe thousands-- some are customized for particular tasks
by the users themselves.