Hi all, I'm glad to inform you about new releases of our completely free (BSD license) cross-platform software, written using Python language and NumPy: OpenOpt 0.31 (numerical optimization), FuncDesigner 0.21 (automatic differentiation, modelling, interpolation, integration), DerApproximator 0.21 (finite-differences derivatives approximation). For release details see http://forum.openopt.org/viewtopic.php?id=299 or visit our homepage http://openopt.org Regards, Dmitrey