So, I started trying to make an excel database of varieties, with genetics where known, just to see what it would look like. The older varieties were easier, because breeders just say "cross of A and B". Modern (university bred) tomatoes have these terribly long, complicated breeding lines behind them. Anyway, here's a start. On the pedigree tab, cell I2 lets you pick a variety, and the chart to the right will update automatically. Instructions to add more are on the instructions sheet. Enjoy.
Dave