Python & Perl
Although I tend to do a lot of my work using MATLAB, the cost of a commercial license is extremely high. This makes it unsuitable for a lot of projects, where the product needs to be freely and easily distributable. For these kinds of projects, I tend to turn to Python.
Here, you can find a few useful code snips that I feel are worth sharing. Please feel free to pass comment on anything you see here. Especially if you think that anything can be optimised or made more robust.