Wormhole for Mac

From plasq:

Wormhole2 is for audio professionals and musicians, allowing routing of audio between machines on a network. Now you can make use of all the un-used processing power in your studio. For example; set aside a machine for complex instruments or effects, route audio out to it, then back into your favorite DAW. Or route audio between your PCs and Macs to get the best of both worlds. Or share audio between laptops on stage. Or or or... there are lots of possibilities! Demo downloadable.

Features

• Audio Unit and VST plugin for Mac OS X and VST for Windows
• Transmits audio over TCP/IP
• Super Low Latency on a LAN
• One 44 kHz Mono Channel requires 175 kBit/sec
• Works with any Network Interface (Ethernet, Firewire, Airport)
• Works with any Audio Units host such as Logic, Garageband, Cubase, Live, Digital Performer, Soundtrack, Metro, ...
• Can be used on a single machine to send audio between applications or to send audio between multiple computers.

Compared to Tigers built in "AUNetSend" and "AUNetReceive", Wormhole2 is crossplatform compatible, significantly less latency and auto compensates for latency and can sync multiple instances.