I'm far from a pro producer, but I use tracktion's daw essentials for tasteful fx. Tal has some free old school chorus and cheesy(in a good way) reverbs, then of course there's Uhe.
I haven't tried there standalone fx, but if their built in synth fx are any indicator, you should be able to get some nice sounds from the standalone fx. I do feel like Uhe fx tend to be a little more opaque in terms of the names and values. E.g. having a filter that goes from 0 - 100 instead of just putting the cutoff frequency is a bit too old school. Having a parameter on a delay that's just called "wow" is not very helpful.
In any case all of these companies support Linux, and they all produce software worth taking a look at.
I haven't tried there standalone fx, but if their built in synth fx are any indicator, you should be able to get some nice sounds from the standalone fx. I do feel like Uhe fx tend to be a little more opaque in terms of the names and values. E.g. having a filter that goes from 0 - 100 instead of just putting the cutoff frequency is a bit too old school. Having a parameter on a delay that's just called "wow" is not very helpful.
In any case all of these companies support Linux, and they all produce software worth taking a look at.