[munificent]

Take a look at Reaper, VCV Rack, Surge, Tyrell, Zebralette, Dexed, and Helm.

[chrislo]

Vital[1] is fantastic, I've been using it a lot.

https://vital.audio/

[yummypaint]

Second for vcv rack. Waveform free has been working well as a DAW for me recently, and it has a linux version.

[peapicker]

Of that list, Dexed is the only one appearing in my tracks regularly. This is because I’m more likely to use Serum, Massive, or Pigments for the other duties. But Dexed, especially after downloading many preset libraries, is freaking amazing in its DX7 early FM synthesis emulation.