OSCar is the successor of the ToscA plugin, and it serves similar purpose.
The OSCar plugin can be inserted into a DAW (Digital Audio Workstation, such as ProTools, Apple Logic, Digital Performer, Ableton Live, etc.) in order to send/receive parameters’ automation.
It is based on the OSC (Open Sound Control) protocol (http://opensoundcontrol.org).
The OSCar plugin does not process any audio (the audio signals are just bypassed actually).