reFuse Software

[Protools5LEGuy]

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/refuse

Maybe 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.

[Protools5LEGuy]

Is there a VST Instrument host with lower footprint than Ugly?

[supernova777]

Is there a VST Instrument host with lower footprint than Ugly?

probably not. ugly is based on MAX/MSP framework... and any other host that small would probably be aswell.l