Goal is to create a list of online resources where you can check audio gear / software compatibility with Mountain Lion. I will continue to add in links and other information as I find it. For now here are 3 links to get started:

Focusrite Product compatibility list:
http://www.focusrite.com/answerbase/en/article.php?id=1185

Novation Product compatibility list:
http://www.novationmusic.com/answerbase/en/article.php?id=743

Native Instruments compatibility list:
http://www.native-instruments.com/en/support/online-help/compatibility/mac-os-x-compatibility/

Please leave a comment if you know any other resources that should be on the list!