Apps, such as Kinpoint, analyze your family tree, explain what information is missing and provide insights into what records you need to search for. Others, like HistoryLines, organize and visualize the lives of your ancestors in unique ways.
My favorite is RootsMapper which syncs with information in your FamilySearch Family Tree. RootsMapper then plots out the routes your ancestors traveled across generations. It's an easy and interactive way to visualize your family's migration.