[free] A collection of MATLAB M-files containing functions for constructing test matrices, computing matrix factorizations, visualizing matrices, and carrying out direct search optimization.
http://www.maths.man.ac.uk/~higham/mctoolbox/
A Matlab/Simulink toolbox for aircraft dynamics research and flight control system design. Features a detailed flight model, autopilot simulation, and user manual.
http://www.dutchroll.com/
Frequently asked questions in comp.soft-sys.matlab.
http://www.mit.edu/~pwb/cssm/index.html
Several versions of DFIELD and PPLANE by John C. Polking, available free for use in educational institutions.
http://math.rice.edu/~dfield/
Provides an interface for visually evolving a "genotype" vector of floating-point values based on a displayable "phenotype".
http://www.cs.wlu.edu/~levy/bw/
[commercial]
http://elecwww.vub.ac.be/fdident/
Providing the MatLinks ToolChest and Chorus ToolBox, peer-reviewed GNU Octave and Matlab/Simulink toolsuites under active development by scientists and engineers around the world.
http://matlinks.net/
MPEG compression algorithms for audio.
http://www.cl.cam.ac.uk/~fapp2/software/mpeg/