Ardour is pretty good. I use it for audio production on Linux and it has quite a few powerful features that many commercial DAWs don't. With Ardour 6 it introdu

Ardour is pretty good. I use it for audio production on Linux and it has quite a few powerful features that many commercial DAWs don't. With Ardour 6 it introduced end to end latency compensation, which is a must have for complex projects, and the current development trunk includes a complete revamp of tempo handling that fixes longstanding issues with rounding error on MIDI region edges and such. I'm very much looking forward to the next release from that branch; it'll have solved all gripes I had with Ardour until now. They keep adding handy features, like the recent volume normalization feature that automatically ajusts your master gain to produce a master at the correct level for different streaming services. Granted, it's not perfect - some people like some of the workflows, some don't - but I find it very good, especially if you spend some time customizing keyboard shortcuts and maybe adding a script or two (it's scriptable in Lua, and you can even write audio plug-ins in that) It supports LV2 and VST2/3 plug-ins natively, and with Yabridge you can bridge Windows VST2/3 plug-ins very seamlessly. (Full disclosure: I have a few bugfix patches in Ardour; I'm fairly committed to it for my needs and happy to help debug crashes and such, though these days they're very rare; the developers are very responsive on IRC though!)