Yep, we'd love to make soul.dev into a place where you can browse snippets of code, search for people's implementations of various DSP algorithms and try them out and put them together - that's all definitely in the plan!
And as far as cross-platform-ness goes, I don't currently foresee a situation where any SOUL code wouldn't run on all platforms.. Running it as WASM in a browser may not be particularly quick compared to the same code running via LLVM JIT or on a DSP, but it should still work.
(And yes... soul.dev certainly uses HTTPS.. maybe whoever posted this story typed it without that)