We are developping several interactive software packages specially designed to proces deep 3D seismic reflection data . These tools have been used to help the design of the ECORS 2.5D project, a crustal scale sparse 3D experiment jointly conducted by IFP, INSUCNRS and ELF AQUITAINE in the North Pyrenean zone during December 1991 . They are also used for the processing of the data, in parallel with the standerd processing carried out at CGG.