Please use Forge2D instead.
This is a Dart port of Java's Box2D libraries.
The Java Box2D library was originally written by Daniel Murphy (status February 2015).
benchmark/bench2d.dart Benchmark used by Joel Webber
example/index.html Browser demos as written by Dominic Hamon
lib/ Port of Daniel Murphy's jbox2d
First Dart port of an earlier version of Box2D library was done by Dominic Hamon. We are grateful for his work.
Not an official Google project