GNU Octave.
Warthog-octave
Warthog is an algorithm that consists of consecutively linking F segments of the same length and with a bearing defined by the fractional part of the function (N^3)/F with N=1,2,3,....,F. The result is surprising figures, increasingly complex as the number of segments F increases. Here is the version for Octave. I also have it for Basic ZX, sdlbasic, gfortran, and Python.
gnu5.2-IC
Hydrometeorological method for calculating flow rates in basins (rational method), programmed according to the recommendations of the Spanish instruction 5.2-IC on road drainage.