Simon created a website to assist people using Box2D. The website features the jBox2D helper.
Link to Simon’s website: https://simon-tiger.github.io/box2d-helper/
GitHub Issue about the project: https://github.com/CodingTrain/Rainbow-Topics/issues/616
Simon ported the code for the examples from the JavaScript version of the book The Nature of Code by Daniel Shiffman. The Box2D helper also comes from The Nature of Code.