From Gordon Gonsalves:
Combinations! is a number-combinations generator, ideal for lotto players, but suitable for anyone who needs a program which can generate combinations of a given set of numbers. Enter up to 20 different numbers and have Combinations! show all 2,3,4... to 19-number combinations of your numbers in a flash. Combinations! can then create a sub-set of the generated combinations at the click of a button (helps lotto players create a manageable set of numbers to play). Generated combinations and sub-sets can be printed or exported to a tab-delimited text file.