Sinnah
"Sinnah is a synth based on a single complex oscillator that includes five waveshapes with increasing spectral complexity, harmonics level for all waveshapes, noise level, and a delay matrix."
Quite a unique sound, not one of those does-everything synths but great for basses, flutey leads and weird feedbacky pads/drones
More features on the way (for which you're invited to contribute ideas), and a paid "Pro" version in the pipeline http://nusofting.liqihsynth.com/Sinnah_VA_synth.html
Noisetar
"Noisetar is a synthesizer dedicated to the generation of many different noise based sounds.
The generation is purely mathematical, no samples or wavetables are used, thus allowing for an easy continuous morphing from one sound to the other. Twelve parameters control the generator, moreover its output can be further shaped and enriched inside Noisetar with its two filters, a chorusing reverb and a stereo enhancer... Noisetar has its own sound space, ranging from various digital noises to crackle, rattles and crepitations similar to wood fire or rain, scratchy percussions and foot stomps, with many others from the lowest booming and gurgling drones, to thin misty hisses."
Again, not for everyone, but worth checking out if you're into experimental electronic music or the outer reaches of cinematic sound design https://nusofting.liqihsynth.com/noisetar/noisetar.html
Descriptions don't really do these synths justice - I've been playing with them all morning and find them really unique and intriguing. And pay what you want! There are some short videos on YouTube that demonstrate some of the patches