The WASM Explorer is a good place to start. I wrote up a little blurb about it: https://hacks.mozilla.org/2017/03/previewing-the-webassembly-explorer/ https://h

The WASM Explorer is a good place to start. I wrote up a little blurb about it: https://hacks.mozilla.org/2017/03/previewing-the-webassembly-explorer/ https://hacks.mozilla.org/2017/03/previewing-the-webassembly... Lin Clark's Cartoon Intro to WebAssembly is also great: https://hacks.mozilla.org/2017/02/a-cartoon-intro-to-webassembly/ https://hacks.mozilla.org/2017/02/a-cartoon-intro-to-webasse... Rasumus Andersson's WASM Intro dives deeper into the binary format and wasm semantics: https://rsms.me/wasm-intro https://rsms.me/wasm-intro Lastly, the WASM Community Group's page at http://webassembly.org http://webassembly.org is quite good. The tooling story is currently the same as it was for asm.js: Use the Emscripten fork of LLVM. Upstream support is being worked on in LLVM, and Rust has a cross-compiler in the works.