Steinberg V-Stack 1.2
Still, as some products depart, others arrive, with Steinberg (www.steinberg.net) bringing VStack to the Mac OS X platform with the newly released version 1.2. VStack is a host for running VST instruments on another system in addition to your main sequencing computer, and offers support for both VST System Link and Rewire. VStack offers a full onscreen mixer with insert and send effects, along with four EQs per channel, and supports master keyboard-type functionality for the layering of multiple VST Instruments on the same MIDI channel, with transpose and split capability. It's available as a direct download from Steinberg's web site, at 49.90 Euros.
Steinberg V-Stack 1.2