Freestyle

Works very well as effect and instrument.
I only miss VST3 plugin support, but this will be coming soon.
Also hope, that plugin latency reporting will be added, too. So the DAW can compensate it correctly.

PROS:

Fast, fast, fast. Low CPU, EXCELLENT visuals and with stout plugin scanner providing thumbnails; gorgeous GUI. Stable. Highly intuitive macro control implementation. You CANNOT do better for a simple modular environment with basic functionality.

CONS:

Just one definitive one for me - inability to split l/r audio. This is one of the reasons to want such a thing. Used this in someone else's setup, and when they implement this, I will buy it immediately.