Since it looks like we're all sharing our web-based synthesizers, here's a FM synthesizer I built with Rust + Wasm with SIMD earlier this year: https://notes.ameo.design/fm.html
Blog post: https://notes.ameo.design/blog/fm-synth-rust-wasm-simd/
I figured what I was working on was pretty niche; it's cool to see so many other people experimenting in this space too