I have been happy using falkTX's Disthro Plugin Framework:
https://github.com/DISTRHO/DPF
It's very lightweight on GUI stuff, so depending on what you want out of a
framework, you may or may not like it.
JUCE is a (very different) alternative: 
https://juce.com/
If you're doing a sampled virtual instrument, you might find HISE useful:
http://www.hise.audio/ ... HISE is built on JUCE.
Regards,
Michael
On Sun, Nov 25, 2018 at 4:26 PM Gordonjcp <gordonjcp(a)gjcp.net> wrote:
  Hi folks,
 At the risk of igniting a flame war, if one were to develop softsynth
 plugins for Linux, what would be the "framework" of choice these days?
 Back in the day I wrote some using DSSI, which was a model I was pretty
 comfortable with.  I had a look at LV2 but couldn't work out how to
 generate the huge incomprehensible non-human-readable "ttl" files.
 Where does the world stand now?
 --
 Gordonjcp
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