The only emulator that I know of that can run Mac OS 9 is SheepShaver. It can be a bit tricky to set up, and it's not the most stable application, and it hasn't been updated in a few years, but it does work. Here is a screen shot of SheepShaver's home page, displayed in the Mozilla browser, running under Mac OS 9.0.4, emulated by SheepShaver, running on my Intel iMac under Mac OS X 10.5.6.
OmniOutliner Essentials and Pro 5.0.4
3 days ago