Current Version: 1.2.1
Download: Installer Package
JK2MV doesn't touch your "normal" JK2 at all. It doesn't use your configs from it nor does it read maps / skins etc. from it. It just needs the game files.
There is a directory "jk2mv" in your users Documents into which your configuration files are saved to.
There is also a portable version available (if you have jk2 installed in "C:\Program Files (x86)\" the portable version can't save configs).
Download: Disk Image
Requires MacOSX 10.9 or newer.
In case your distribution is not deb/rpm compatible, you can always build jk2mv from source.
In Short: Use it exactly as you would use the old jk2ded, except that you can easily choose which gameversion to host with the mv_serverversion cvar.
License: GPLv2 (http://www.gnu.org/licenses/gpl-2.0.html)
Contributing: We are a really small team, visit us on IRC #jk2mv @ QuakeNet for development related discussion.JK2MV on Github