Mac OSX
From JRiverWiki
An audio only version of JRiver Media Center for Mac was released on February 22, 2013. You can learn more by visiting the Mac board here: http://yabb.jriver.com/interact/index.php?board=31.0
Airplay is reported to work with the Mac version.
JRiver Media Center can also be run under Parallels and Wine:
http://yabb.jriver.com/interact/index.php?topic=66213.msg444318#msg444318
http://yabb.jriver.com/interact/index.php?topic=65132.msg436427#msg436427
Misc
Making folders visible: http://yabb.jriver.com/interact/index.php?topic=79102.0
Where are files located? http://yabb.jriver.com/interact/index.php?topic=78996.0