OpenOpt

Universal cross-platform (Win, Linux, Mac OS) Python-written numerical optimization toolbox. License: new BSD. Problems: NLP, LP, QP, SDP, SOCP, DFP(Non-linear Data Fit), NSP(nonsmooth), MILP, LSP, LLSP, MMP, GLP, MINLP etc. Connects to dozens of solvers (some are C- or Fortran-written). Provides graphic output of convergence and some more numerical optimization "MUST HAVE" features. Can involve automatic differentiation of FuncDesigner (http://openopt.org/FuncDesigner) models.
Find OpenOpt at: http://openopt.org