http://gn.mines.colorado.edu/1/csm/software/
CWP/SU Seismic Software is a free software package created at the Center for Wave Phenomena, Colorado School of Mines. The package is an 'instant exploration seismic research and processing environment' for UNIX-based machines. The package contains tools for reading/writing tapes in the SEG-Y format, manipulating seismic data in the SEG-Y format, Fourier transforms, filtering, synthetic data generation, and seismic migration.