Evolvotron is an interactive "generative art" application to evolve images/textures/patterns through an iterative process of random mutation and user-selection driven evolution. If you like lava lamps, and never got tired of the Mandelbrot set, this could be the software for you. It's implemented using Qt, and is multithreaded.
FooTex is software for converting LaTeX math markup into MathML, HTML, or PNG. It is basically just a wrapper for texvc and blahtex. It provides some extra functionality, and gives a consistent interface to the functionality of the two underlying packages. The documentation is built into the source code. When you install footex, the documentation will be installed as a man page.
MBDyn features the integrated multidisciplinary analysis of multi-body, multi-physics systems, including nonlinear mechanics of rigid and flexible constrained bodies, smart materials, electric networks, active control, hydraulic networks, and essential fixed-wing and rotorcraft aerodynamics. It allows you to simulate the behavior of heterogeneous mechanical, aero-servo-elastic systems based on first principles equations. It is being actively developed and used in the aerospace and automotive fields for dynamics analysis and simulation of complex systems. The extension of available analysis domains to new models, and new analysis domains, is planned and problem-driven.
qombinatorics is a graphical user interface to combinatorics calculus. With it you can easily calculate permutations and combinations of objects, as well as binomial coefficients. The results can be employed in many fields of statistics and probability calculation, graph theory, and so on. The software can also be useful for amusing activities like card playing.
EngLab is a cross-compile mathematical platform with a C like syntax intended to be used both by engineers and users with little programming knowledge. It supports programming through small script files but also enables users to easily compile their own functions as shared objects and use them through the program's main interface.