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One that comes to mind is the WASM port of FFmpeg:

Another is the SQLite WASM project:

Also v86 for x86 machine virtualization in the web browser:

A fun project is WASM-4, for building retro-style games:

Possibly more interesting projects to be found here:

Zoom uses it quite extensively, Figma is built in it.

Just to be clear, wasm is usually a compilation target, not someting written by hand like on that site.

Google Earth in the browser uses WASM too:

Fluid dynamics in your browser with a Julia program compiled to WASM:

Draw fluid boundaries with your mouse!

My understanding is that https://photopea.com (very handy for basic photoshopesque image manipulation) uses it

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