The Internet Archive using a Flash emulator written in Rust and compiled to Webassembly to preserve historic Flash animations and make them playable in modern browsers.

https://news.ycombinator.com/item?id=25154128

https://blog.archive.org/2020/11/19/flash-animations-live-fo...

https://ruffle.rs/

For me, it's definitely Blazor: https://dotnet.microsoft.com/apps/aspnet/web-apps/blazor

Initial load times could be still better (.NET 6 should improve that) and Visual Studio's Razor syntax support could be improved, but other than these, as a hardcore .NET guy, I find a lot joy in working with it.

How about the interface design tool Figma?

https://www.figma.com/blog/webassembly-cut-figmas-load-time-...

Emulators, of course ;)

https://vaporboy.net/

PARI/GP for number theory calculations, is now in the browser thanks to WebAssemly.

https://pari.math.u-bordeaux.fr/gp.html

https://squoosh.app/

Lichess using Stockfish

https://lichess.org/blog/X9uXyxUAANCqN1OF/stockfish-12-on-li...

The interesting ones for me are Cloudflare workers and Fastly Cloud@Edge. The next generation of serverless, WebAssembly has huge potential outside the browser

Not sure if youve seen this:

https://madewithwebassembly.com/

I am using it an expression evaluator in my library