phpMyAdmin is very popular tool, but for whatever reason number of contributors is not that high as you would expect in such famous project. We're not looking only for developers, basically anybody can help!
Working with phpMyAdmin will give you great opportunity to participate in one of most popular free software projects (we're constantly ranked in 20 most downloaded projects on SourceForge.net for many years). You can learn a lot and extend your knowledge by cooperating with other skilled people. And of course you can use this reference in your resume :-).
So how you can help? You can help with translating, writing documentation, creating video tutorials, bug screening or coding. You can see all possibilities in more details on our website.
http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-design/