3D Slicer is a multi-platform, free open source software (FOSS) for visualization and image computing.
Slicer, or 3D Slicer, is a free, open source software package for visualization and image analysis. 3D Slicer is natively designed to be available on multiple platforms, including Windows, Linux and MacOS X.
- 3D Slicer page at Medfloss
- Ohloh factoids about Slicer