Rosetta Code is a great example of something similar, but we also want to add more constraints and make it possible to actually call the code automatically.
If you take a look at the implementations of Conway's Game of Life in Rosetta Code -
http://rosettacode.org/wiki/Conway%27s_Game_of_Life - you can see implementations in many languages, but they are often subtly different, and there's nothing in the system to avoid that. We want to avoid that divergence, and we want to allow users to enter the input data, click on a button, and run the code.
But still, Rosetta Code illustrates neatly some of the aspects of the project vision, yes, thank you for that pointer!