I posted earlier but can’t see it here: I run Linux on my studio machine, using Ardour (DAW, recording samples), Audacity (editing samples), Noise Repellent (an LV2 plugin which does spectral noise analysis / reduction), and sfizz (SFZ player, both standalone and as an LV2 plugin). The Virtual Playing Orchestra is a large set of SFZ instruments, based on the Sonatina Symphonic Orchestra and a bunch of others.
In addition to the pure FLOSS tools, I have gotten several of Spitfire’s non-Kontact instruments running under a very recent version of Wine.
A good overall resource is the Linux Musicians forum.
Hope that helps!