QT is a free and open-source widget toolkit for creating graphical user interfaces as well as cross-platform applications

Diablo 1 for web browsers

Cross-platform game engine with a web export powered by WebAssembly

Google Ink is a proprietary freehand drawing library powered by WebAssembly, which powers Google Apps like Chrome Canvas and Google Keep.

A practical example of sql.js being implemented on a site.

A simple and easy-to-use library to enjoy videogames programming

lichess is an open source chess server, that is in Alexa's top 2000 sites. lichess uses WebAssembly for it's chess engine analysis.

Wasm By Example is a website with a set of hands-on introduction examples and tutorials for WebAssembly (Wasm)

Remove background noise from audio files online for free.

Near Protocol is public blockain for builing decentralized applications using WebAssembly (AssemblyScript)

Quicky test and visualize your Go templates live.

WAVM is a WebAssembly virtual machine, designed for use in non-web applications.

Port of the OpenCascade CAD library to JavaScript and WebAssembly via Emscripten.

Letter Opener is a web app, that allows you to open and view Winmail.dat, MSG and EML e-mail files.

Authentication and key exchange protocols

Cross-platform game engine with a web export powered by WebAssembly

Command Keen is an old school PC platformer by id software. Ported to the web with WebAssembly and Emscripten.

Amped Studio is a modern web based music studio and production environment.

1Password used WebAssembly to speed up their browser plugin

Wasm-based PDF and MS Office SDK. View, annotate, edit, automate, and more.

An acoustic absorption calculator to help in the design of home cinemas or recording studio environments