Antares has a new plugin called Tube. It is an analog tube modeling plugin in the same vein as AmpliTube, except Tube is more affordable, but has the same quality. I tried it out, it really kicks on guitar. Yet, it is great for vocals, acoustic guitar, horns, strings, synth pads, etc. They have a fully functioning demo here:
http://www.antarestech.com/products/tube.html
Reguirements: Macintosh RTAS, MAS and VST
* A Macintosh with a PowerPC processor running OS 9.x.
* A host program that supports the appropriate plug-in architecture.
Note: Current Mac versions of Tube are for OS 9.x only. OS X versions will be appearing shortly and will be a free upgrade.
http://www.antarestech.com/products/tube.html
Reguirements: Macintosh RTAS, MAS and VST
* A Macintosh with a PowerPC processor running OS 9.x.
* A host program that supports the appropriate plug-in architecture.
Note: Current Mac versions of Tube are for OS 9.x only. OS X versions will be appearing shortly and will be a free upgrade.