Excellent overview of what WebAssembly enables today, and the features it will enable in future: https://hacks.mozilla.org/2018/10/webassemblys-post-mvp-future/
(High performance sandboxed execution! Better dev tools!)
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I'm still experimenting with UIs for live (sandboxed) evaluation of tests. I've realised that you really want to highlight the failing assertion, not just the failing test.
Feedback welcome :)
WASI is developing a portable, sandboxed system API so you can run WebAssembly outside of a browser: https://hacks.mozilla.org/2019/03/standardizing-wasi-a-webassembly-system-interface/
WebAssembly has a ton of people doing interesting things, but I do feel there's some overlap with what the JVM planned to do.
Snaps are self-contained (i.e. bundling dependencies), sandboxed applications that work across different linux distros: https://arstechnica.com/information-technology/2016/06/goodbye-apt-and-yum-ubuntus-snap-apps-are-coming-to-distros-everywhere/
This is the first I've heard about them. They seem to be more popular in the area of proprietary software on linux.

