Processing.js was a port of the Processing programming language for the web, and was maintained from November 2011 to December 2018, having been unofficially retired in March of 2017.
If you're looking for the last version of Processing.js before the project was officially discontinued, you're looking for v1.6.6.
That last version of the website itself can be found as an archived tree on github.
If you want to use Processing on the web today, please have a look at the newer P5.js project, which was a reimagining of Processing "if it had been designed for use on the web from the get-go".
Thank you to everyone who used Processing.js in the past, and of course: everyone who worked on the project over the years.
- The Processing.js Team