Cheerp C++ To Webassembly Compiler Now Open Source

 Cheerp is a C/C++ compiler for Web applications that lets you compile virtually any C/C++ code to WebAssembly and JavaScript. Its latest version 3.0 has been open sourced.

Cheerp is used primarily to port existing C/C++ libraries and applications to HTML5, but can also be used to write high-performance Web applications and WebAssembly components from scratch. Using Cheerp, C/C++ code gets compiled into JavaScript/WebAssembly as well as becoming optimised with the right JavaScript interfaces being exposed, and can be easily integrated in a web application.

https://www.i-programmer.info/news/90-tools/16218-cheerp-c-to-webassembly-compiler-now-open-source.html