Reaper supports VST on *nix, LADSPA and uh basically everything else, runs natively on *nix, and costs 60 bucks for two major versions.
Still proprietary, but it and Renoise are the "good" ones.>>3769
Eh, before 3.0 it was kind of ok, if severely limited. It's very much a multitrack emulator.
Since 3.0 they're datamining and so on so like, trash.