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Plogue Bidule is an interesting little app; It just uses node graph with a few basic primitives and a VST container for plugins. I use it all the time if I just want to fire up a virtual synth without loading an entire DAW.

You can get Tracktion 7 for free on all those platforms: https://www.tracktion.com/products/t7-daw

For Linux, I use Jack [0] (low-latency audio API) + Carla [1] (VST host) + Claudia [2] (session manager)

For OS X, Logic Pro is good and very affordable.

[0] http://jackaudio.org/ [1] https://kx.studio/Applications:Carla [2] https://kx.studio/Applications:Claudia

Logic Pro to my knowledge cannot host VSTs. But many VSTs have Audio Unit ports which it can use.

Yeah, good point. I take VST as a generic term for audio plugins. Most VSTs (including surge) will have AU ports as well.

I really like Reaper, it's cheap, has a long (unlimited) free trial, and runs on Windows and Mac.

It runs on Linux too