Processing download link: https://processing.org/download/

Special instructions for chromebook users:

1. Follow the instructions here in order to enable the running of Linux apps on the chrome book.
2. Download the 'Linux' version of processing from the website above
3. Move the downloaded file "ends in tgz" into the Linux folder of the chromebook.
4. You will have to unzip the tgz file, instructions can be found here (https://www.businessinsider.com/how-to-unzip-files-on-chromebook)

if for some reason the software cannot be installed there is a nearly identical browser based version of processing called "p5js" 

https://editor.p5js.org/