GeoCT-II is a 2D seismic modeling and imaging software package designed for geophysical engineering applications.  It includes an advanced model builder, finite-difference full wavefield calculation for acoustic, elastic, and anisotropic media, raytracing and tomography for refraction, reflection, crosshole and VSP geometry.  With a variety of features, GeoCT-II is able to help you understand data and image any complex velocity structures rapidly.

GeoCT-II is currently for Windows XP and Linux.