Processing.js is described as 'Open programming language, port of the Processing Visualization Language, for people who want to program images, animation, and interactions for the web without using Flash or Java applets. Processing' and is an website in the development category. There are more than 25 alternatives to Processing.js, not only websites but also apps for a variety of platforms, including Self-Hosted, Mac, Windows and Linux apps. The best Processing.js alternative is D3.js, which is both free and Open Source. Other great sites and apps similar to Processing.js are Processing, RAWGraphs, p5.js and Anime.js.