Tomlab (Popularity: )
http://tomlab.biz/ [commercial] Provides state-of-the-art optimization, with fast and robust solutions to sparse and dense linear, quadratic and nonlinear programming problems.
FEMLAB - Multiphysics in MATLAB (Popularity: )
http://www.femlab.com/ [commercial] A powerful interactive environment for modeling and solving scientific and engineering problems involving partial differential equations.
MatLinks Software Network (Popularity: )
http://matlinks.net/ Providing the MatLinks ToolChest and Chorus ToolBox, peer-reviewed GNU Octave and Matlab/Simulink toolsuites under active development by scientists and engineers ...