Go's support is pretty good (with tinygo offering a tiny runtime more suited to this application). Rust appears to support compiling directly to WebAssembly, and there are some smaller languages like AssemblyScript and Lua with support. I'm guessing plain C works fine. Then there are projects that compile the runtime for interpreted languages to WebAssembly, so you can theoretically run things like Python.
Nobody is writing applications in C or AssemblyScript, so that leaves rust or go. If you're using one of those languages, though, you can just (cross-)compile a binary and copy it to a VM that is on some cloud provider's free tier, so this isn't really easing any deployment woes. It was already as easy with native code, so WebAssembly isn't adding much stuff here. (The isolation aspect was interesting in the days before Firecracker, but now every computer has hardware virtualization extensions and so you can safely run untrusted native code in a VM at native speeds.)
Anyway, I always wanted WebAssembly for two things: 1) To compile my React apps to a single binary. 2) To use as a plugin system for third-party apps (so I don't have to recompile Nginx to have OpenTracing support, for example). The language support hasn't really enabled either, so I'm a little disappointed. (Disappointed isn't really fair. I've invested no effort in this, and I can't be disappointed that someone didn't make a really complicated thing for me for free. But you know what I mean.)
