A downloadable Tool for Windows, Mac OS X, and Linux
This is a bare bones Unity3D pixel editor. An entry for the #toolboxjam. The tool allows you to create new pixel sprites as well as edit existing pixel sprites. There's the pen, eraser, and color picker. What else do you need? Save your sprites directly back into your Unity3D project and use them in your game immediately without leaving the editor. Source code available on Github.