Weedwacker is technically subtractive, but it’s such a unique ensemble that I would still consider it essential for your list. It’s pulse waves where the output is fed through a bandpass filter and back to PWM. It’s possible to get extremely interesting harmonically tuned chaotic feedback, there’s just nothing else like it, I’ve been toying with the idea of making a hardware version, but I don’t know, it sounds so good in software, really upsetting the idea that only analogue can be “organic” that it might be disrespectful to do so!
You should also check Adlais by David Elson. I think it’s original inspiration was the Scott Stites Klee shift register sequencer, but it’s something different. Really interesting semi generative evolving patterns.