MathOO: Adding Python style Object Orientation to Mathematica with MathOO (1.0 beta launch) [Alternative to Objectica]
Mathematica is a very useful software in many science fields. It supports procedural programming and functional programming. However, it does not support the modern object oriented programming. If you would like to add that, there is a package called Objectica, and it will cost you quite a fortune ($1000 on 3/11/2010).
Here I have developed a Mathematica ...