There are many tools to help developers create games with XNA. For instance there is Farseer Physics, a free open sourced 2D physics engine, and Gleed2D, a free 2D non-grid level designer. But out of all of these tools we have not been able to find a single tool that helps developers create skeletal animations in 2D.
That is why here at DragonSwords Studios developed a program named DragonBone. DragonBone allows developers to create 2D skeletal (also known as bone) animations. Originally designed for our own projects, DragonBone is now available for free at http://dragonbone.codeplex.com/.