The best alternatives to Zum are HopSkipDrive, Lyft, and Kid Carpool. If these 3 options don't work for you, we've listed a few more alternatives below.
GoKid Carpool App - now available on Android - makes scheduling and tracking carpools for your kids to school, sports and other activities easy and secure. Set up your schedule, invite friends to join, share the driving! The app sends out automatic reminders and keeps everything organized.