Nexus is an oil and gas reservoir simulator originally developed as 'Falcon' by Amoco, Los Alamos National Laboratory and Cray Research. It is currently owned, developed, marketed and maintained by Landmark Graphics, a product service line of Halliburton. Nexus is used by oil and gas companies all over the world.
Nexus will gradually replace VIP, or Desktop VIP, Landmark's earlier generation of simulator.