The core code lives in the SerenityOS repo (which is an OS built from scratch too!):<p>* LibWeb (HTML, CSS, SVG, Web APIs): <a href="https://github.com/SerenityOS/serenity/tree/master/Userland/Libraries/LibWeb" rel="nofollow">https://github.com/SerenityOS/serenity/tree/master/Userland/...</a><p>* LibJS (JS engine): <a href="https://github.com/SerenityOS/serenity/tree/master/Userland/Libraries/LibJS" rel="nofollow">https://github.com/SerenityOS/serenity/tree/master/Userland/...</a><p>* LibWasm (WASM interpreter): <a href="https://github.com/SerenityOS/serenity/tree/master/Userland/Libraries/LibWasm" rel="nofollow">https://github.com/SerenityOS/serenity/tree/master/Userland/...</a><p>and the UI lives in <a href="https://github.com/SerenityOS/ladybird" rel="nofollow">https://github.com/SerenityOS/ladybird</a> and can be built for Linux/Mac/Android.