|Operating system||Any Platform that supports .Net 2.0 or greater|
Physics2D.Net is two-dimensional rigid body physics engine written in C#. It has quite a few features including: stacking, joints, gravity, water, and is highly optimized for a large number of objects. As of writing it is compatible with every runtime for .NET 2.0 or greater, this includes Silverlight, XNA and Mono.
Physics2D.Net was created by Jonathan Porter.