These would also be called Serviceberries. Sometimes called Juneberries. Lovely (but short lived) tiny white flowers in the Spring lead to purple berries in June. At least around here!
There are many varieties, some bushes, some trees. In my yard I have many of the "Regent" Serviceberries. These set fruit heavily, the berries are larger than on other types and they only grown into 5-6 foot shrubs. Taste like really bland blueberries to me. But the Serviceberries are very easy to grow and the backyard birds love the fruit. Sometimes I eat some straight off the shrub, otherwise I leave the berries for the birds and the wildlife.