Came across this just now, but I can not get it to run due to syntax issues.

https://github.com/jsbsan/gbbox2d

Would be rather interesting if I can get it working.

I found a readme file in the 'javascript' folder, but I am not sure what it means: -

How to use
1. put js/ and lib/ in your app dir
2. add script tags refering the header of index.html