You won't have much luck finding out about tomato crosses. There were literally tens of thousands of crosses done in the last hundred years, but most of that information is more or less hidden as coded information by university, government, corporate, and private breeding programs around the world. I say coded because most of the plants were never named and are only known by a number. A few of the old commercially grown heirlooms like Rutgers (Marglobe x JTD) have publically known parentage, and if you asked Tom Wagner what is behind Green Zebra he probably would happily write two pages on the pedigree, but good luck trying to find out what the second parent to Big Boy is (Teddy Jones is one parent) because it is a corporate secret. The seed/rights to Teddy Jones, (a 1940s heirloom beefsteak) were bought up so noone outside of the breeders have it. The parents of other F1 hybrids are also closely guarded secrets.
There is some information on a few Cherokee Purple crosses because Keith Mueller developed a series that came out of CP x Brandywine. These include Gary'O Sena, Liz Birt, Dora, Brandokee, and Laurel's California Gold.
Contrast this to orchids where names are registered by a single governing body and so every single one of 75,000 hybrids has had its parentage published since the 1800's. Today you can buy software to look up those pedigrees in an instant.
If you want to know what the genetic mix of two varieties will produce I can help with that, because there are only a handfull of genes that control the outward traits and they are almost all Mendelian dominant/recessive, and thus predictable.