Proland (for procedural landscape ) is a software platform originally developed for the NatSim project. It has also been developed using fundings from the GVTR project, and it is the basis for our participation in the MarketSimGame project (see Section 7.4 ). The goal of this platform is the real-time rendering and editing of large landscapes. The second version started last year integrated a terrain renderer, billboard cloud forests, and atmospheric effects. This year Antoine Begault ported in this new version our work on vector based terrain rendering and editing, as well as the work on the real-time animation of large scale rivers. We also integrated our work on ocean rendering (see Section 6.3.3 ). All features can work with planet-sized terrains, for all viewpoints from ground to space. Proland versions have been deposited to APP (Deposit numbers IDDN.FR.001.390029.000.S.C.2008.000.31500 and IDDN.FR.001.390030.000.S.P.2008.000.31500). A licence of this software has been sold to RSA Cosmos, a company developing digital planetariums.