Gocad is a 3D modeler dedicated to geosciences. It was developed by a consortium headed by Jean-Laurent Mallet, in the Nancy School of Geology. Gocad is now commercialized by Earth Decision Sciences (formerly T-Surf), a company which was initially a start-up company of the project-team. Gocad is used by all major oil companies (Total-Fina-Elf, ChevronTexaco, Petrobras, etc.), and has become a de facto standard in geo-modeling. Last year, Laurent Castanié's work (CIFRE Earth Decision Sciences, defended in 2006) was successfully integrated in the VolumeExplorer plugin of Gocad. Luc Buatois's work on GPU-based numerical solvers [Oops!] will be integrated in Gocad's flow simulator.