The FastICA package is a free (GPL) MATLAB program that implements the fast fixed-point algorithm for independent component analysis and projection pursuit. It features an easy-to-use graphical user interface, and a computationally powerful algorithm.
FastICA in C++ (part of IT++ package)
FastICA in Python as part of MDP package
FastICA in Python as part of scikit-learn package
What is independent component analysis? -- papers and links