In our school, we frequently want to generate rosters for e.g. advisory groupings. Often these rosters need to be grouped by certain parameters (say, by grade level) and then distributed by others (say, we want to divide kids evenly by gender).

I made a general purpose tool which allows you to take information about individuals in spreadsheet format and then form groups, using the different columns of data either to sort kids (e.g. into grade level groups) or spread them out (e.g. by gender).