What are /r/vcvrack's favorite Products & Services?

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For apps on mobile with modular aspect, what I can think of are Caustic 3 and Sunvox. Caustic 3 requires full version to save, while Sunvox is not free. However both of them also have a PC version, and IMO Sunvox even has a Raspberry pi version.

I'm also on a Mac. I use IAC to route MIDI back and forth between Ableton and Rack. I use Blackhole to route audio back and forth. I use Ableton's CV Tools to send modulation and clocks back and forth.