They STILL sell products for OS9.
Ugly VSTi Interface
http://www.refusesoftware.com/ugly FREE! Any VSTi made Standalone
And the most important for me:
Refuse (OS9 ReWire Connectivity) cost 29$ but I think it worth paying it. Still in 2014! It seem a cool way to work a la BT without TDM hardware. reFuse works in two areas: audio routing and transport linking. Audio is sent from Reason, into reFuse, and then out to Pro Tools. Depending on the capabilities of your system, you can use up to sixteen discrete channels of audio via DirectConnect.
http://www.refusesoftware.com/refuseMaybe there are more OS9 plugin versions, but they still develop even AAX plugs (Protools 11)
Opinions about any of these software is welcome as always.