PhysiX is an interactive website which follows the principle of a "wiki". It provides articles, applets and code, mainly about orbital and molecular orbital and its pages are freely editable by whoever registered.
The articles on offer on PhysiX form a highly accessible description of atomic and molecular orbitals, complete with simple examples, along with the equations which allow us to calculate the wave functions and the general form of the solutions. These articles are largely inspired by the quantum chemistry courses taught at the Ecole Polytechnique. The section on molecular orbitals contains detailled explanations of the superposition principle and the overlap principle, illustrated by classic case studies.
Many of the articles on PhysiX are illustrated by Java applets, which let users visualise real and complex atomic orbitals and molecular orbitals and change various parameters in these simulations. There are two main advantages to these applets : they make quite abstract concepts seem much more concrete, and they are also a good interactive learning tool, as they allow the user to choose the model's parameter. You will also find videos which virtually recreate the time evolution of various systems. Once again, users can create their own videos by following the instructions given in specific pages.
Following the same ethos, the code used to create all the images, applets and videos on PhysiX has been made available to all users. It is obviously well commented, so as to allow anyone to re-use it as they wish: those who simply want to use some of the functions without worrying about the actual code can read the explanatory passage which is supplied with it, and those who wish to personnalise and/or change the code are free to do so too. Whatever your situation, we've tried hard to make the code and the algorithms as accessible as possible so that anybody can re-use our material, without having to be a specialist programmer!