Project Euler solutions. I attempt to find the perfect balance between making extremely efficient/optimised code, 'code-golfing', and also having the solution be understandable/intuitive.
Currently, most of problems have only python solutions—I aim to eventually offer solutions in the majority of the popular scripting languages. Some languages (especially C and FORTRAN) may not offer the most efficient solution in an attempt to display how to properly use some of their features.
Also, in accordance with Project Euler's request, problems beyond 100 will not be visible publically—encoded with the problems' answer as the key.