DeaDBeeF needs you!
If you can program in C, you can help the project with plugins development
If you need more help - drop by on IRC (#deadbeefplayer channel in FreeNode network)
check out feature request tracker for plugin requests.
check out the [Plugins] page for links to other people's work.
i didn't plan to support OSX, but requests for it keep coming, so there seems to be a demand.
the only thing missing is CoreAudio output plugin. or any other output plugin that would work on OSX.
compiling on OSX is quite a challenging task, but we have some handy scripts to fetch and compile all required dependencies.
it would also be nice if someone makes a distributable package with all the libs bundled in.
one of our IRC channels is the best place to start.