CustusX is built on top of several other open-source libraries, with their own licenses. They are listed here:

Name	Website
CMake	http://cmake.org
Qt	http://qt-project.org/
VTK	http://vtk.org
ITK	http://itk.org
CTK	http://commontk.org
Eigen	http://eigen.tuxfamily.org
OpenCV	http://opencv.org
IGSTK	http://igstk.org
OpenIGTLink	http://openigtlink.org
FAST	http://github.com/smistad/FAST
Qxt	http://dev.libqxt.org/libqxt/wiki/Home
Boost	http://www.boost.org
Catch	http://github.com/philsquared/Catch
Doxygen	http://www.doxygen.org

Code from other sources not listed here may be present in the CustusX source code. The original author and licensing is then descibed in the source.