I'm a high school teacher looking for a free mac software program for grades. My school uses Grade Machine, which I don't particularly like (and isn't compatible with my mac). I calculate my grades based on percentages instead of total points (i.e. their average homework grade is 15% of their total grade) Can anyone recommend something free and offer a download link? Thanks, Shannon ETA: While I prefer a free program, I'd be willing to pay up to $40 for a good program.