Itksnapsb is a project mainly written in C++ and C, it's free.
Modified version of itk-SNAP.
itksnapsb is an extension of ITK-SNAP version 2.0 and provides additional features such as flood-fill operations and user landmarking. The modified source code is provided and the original ITK-SNAP source code can be downloaded from:
http://www.itksnap.org/
Terms and Conditions governing the use of itksnapsb
Copyright 2010, Dr. Sandra Black Linda C. Campbell Cognitive Neurology Unit Sunnybrook Health Sciences Center
itksnapsb is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.