Sometimes we get questions on identifying different varieties of a plant-this can be a great challenge! Below is a growing list of websites & information that can help.
Fruit Cultivar Identification websites
Apple ID: Applename.com
Cherry ID: Dave Wilson Nursery page on cherry varieties has about 20 cultivars pictured with short descriptions on each.
Iowa University Extension Viticulture website has a nice listing of common grape cultivars for cool climates and includes color pictures of grape bunches. Navigate varieties via the column on the left-hand side of the page.
National Grape Registry based out of UC-Davis has the exhaustive list of known grape varieties. Does not contain photographs.