Sudokuki is a graphical SUDOKU game. It solves even the most difficult sudoku grids for you. It can generate a sudoku, play sudoku, and print a sudoku.
Inptools provides means to convert and reproject files in the EPANET INP format. It includes the shp2inp, inp2shp, epanet2csv, and inpproj commands. (EPANET is water supply network analysis software.)