Camelot is a joint project from keyboard makers Fatar and Audio Modelling Instruments - its a host application for playing, layering and routing physical and virtual instruments in a live environment. With some nifty features for audio routing, patch reading from physical hardware, keyboard zoning and layering, similar to Apple's Mainstage which has become an industry standard for this sort of thing.
Good news is that it will run on Mac and PC and iOS too.
Camelot is entering public beta soon and will be available later this year.
Deep look at the new generation interface