CVS is Current Versioning System or something like that. I makes it easier for a widely spread group of developers to keep track of versions and files.
there is a CVS server running at cvs.limewire.org and you can use a CVS client (a software program running on your computer) to get access to the server and download or contribute (upload) files. for contributing you need specific rights which you don't have as a guest. but as a guest you might download.
go here to read more about CVS and Limewire:
http://www.limewire.org/docs/ddCVS.html
This is a windows CVS client:
http://www.cvsgui.org/download.html
this is a java cvs client:
http://www.jcvs.org/
mahalo