I guess XAMPP could be considered a distribution since in essence it is a packaging of GPL and other open source software. Is the source of the build process that creates the XAMPP package available?
I really like the XAMPP package and the only component missing from it that I really, really would like to have is Oracle support built into PHP 5. There is a Oracle 10g client for Mac OS X that is backwards compatible that allows 8i and 9i connections that is a free download from oracle. So you distribute the scripts that build the package I'd be happy to share back the documentation to build Oracle support into the XAMPP package.