You can find all the source code on
http://www.sourceforge.net. Just search for the PlaneShift project there. All the code is in the CVS.
At the moment we already have somebody working on the Mac version of the client. He has it up and running so most ( all? ) of the work to convert PS to Mac is done. However, he is trying to increase the performance in Crystal Space since it seems to be lacking ( but has made some really good progress). He is in contact with ATI in order to work out some problems.
However, we can always use more people to work on the Mac client since it\'s only Lightyear at the moment.
So hopefully the Mac client can be released in due course.
You may also want to check out this
thread