AlexanderJYu/GroupMeetup
An iPhone/Android App that's helpful when a large group has a meetup for a few days -- creates "events" and adds phones to them. Then, the other phones in the event can see where all the phones are in a map for the duration of the event. There is also group text messaging capability, tie-ins with calendar (for the schedule of the events), and more. Data is managed via a database.