Quick, reliable, public transportation is a necessity, but access to real-time information about transportation should be available as well. Is the bus running late? Is there a better route? The ability to receive alerts and use apps that tell users the best routes and when a bus or subway will arrive can make mass transit more convenient.
Even city-sponsored bike-sharing programs that rely on data-analysis and transporting bikes from where they're dropped off to where they're needed next are having a significant impact on traffic in some places like Boston and New York.
Beyond transportation, accessibility to real-time information from the city or power utility can alert citizens when to power down and conserve energy to prevent brown outs. Notifications from the parks and recreation department can alert residents to an upcoming 5K or fun run that might be of interest based on a citizen's profile they filled out with the parks and recreation department. Even apps that help citizens find out where to vote and deliver local election results in real-time can provide meaningful information to make cities better places to live.