Rancke Note (2015)
The entry in GT:Humaniti only mentions variant human races, but I think it extremely unlikely that no other race would have created variants of themselves, although no doubt humans have been more prolific than most (or all). YMMV (Your Mileage May Vary).
Smelchak Note (2016)
By canon, the Vargr have made variant races from their baseline genome.