OpenVL is a framework for handling, processing & visualizing volumetric data (CT, MRI etc). It provides: powerful data access & layout API, plugins for volume processing tasks (image processing, segmentation etc), and support for multiple file-formats.
Sled stands for SLice EDitor. It aims to be the ultimate tool for viewing and editing 3D volume datasets. Those working in the field of volume visualization will appreciate this tool a lot!