Seed companies have done [mostly] one of two things lately:
been bought out by Monsanto
closed ranks against Monsanto and labeled everything they carry as guaranteed non-GMO
The latter companies keep track of the former, and the info is fairly easy to find, particularly through Baker's Creek Heirlooms, which is owned by some of the folks leading the fight against Monsanto.
Hybrids are no worse than heirlooms/open pollinated varieties.
The reason for this is: all heirlooms/open pollinated varieties were once hybrids. What they are is
Stabilized hybrids, selected through several generations until the wanted characteristics come through on a consistent basis. A first generation cross, what most people know as 'hybrid' is F1. Parent x Parent=F1 baby. Seed saved from the F1, is F2. Generally, at the F8 generation, the variety is considered stable and can be called open pollinated.
Hybridization has been used for centuries to select for hardiness, flavor, color, and other wanted characteristics.
For instance, did you know that once there were no orange carrots? They were all white or yellow. I believe they didn't appear until the reign of King Henry VIII, and then as a novelty. Obviously a popular novelty.
Some species, like apples, require hybridization to set fruit. Every
apple seed is unique. They do not breed true to the parent plant. This is why varieties are propagated by grafting.
The main difference between hybrids and open pollinated varieties is that you can trust that the seed you save from an OP variety will be the same as the parent plant, where with a hybrid you'll get a mixed bag of genetics that may turn out wonderful, horrible, or average.