Apps similar to WebAssembly include JavaScript, which is free and open source. Other options are ReScript, Bosque, Native Client and PureScript. In total there are five Programming Languages like WebAssembly for Mac, Windows, Linux, the web and Android.
JavaScript (sometimes shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, most known as the scripting language for Web pages, but also used in many non-browser environments.
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ReScript is a robustly typed language that compiles to efficient and human-readable JavaScript. It comes with a lightning fast compiler toolchain that scales to any codebase size.
The Bosque programming language is an experiment in regularized design for a machine assisted rapid and reliable software development lifecycle.
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Google's Native Client brings the performance and low-level control of native code to modern web browsers, without sacrificing the security and portability of the web.
PureScript was initially designed by Phil Freeman in 2013. He started to work on PureScript since he wasn't satisfied by other attempts to transpile Haskell to JavaScript (e.g. using Fay, Haste, or GHCJS).
