If you fancy a Buchla-Style Synth For Reaktor, check out Trevor Gavilan's Cloudlab 200t, which is based on a Buchla 200 and 200e modular system. Trevor says that it has been created for fun, having a Buchla resemblance and workflow for inspirational purposes.
Pricing and Availability:
Free. But you need Reaktor 6.
Seamless audio and MIDI switchover between computers