An app I created during a hackathon hosted by my university,
with which I came first place, garnered 1500 downloads, and won $2500.

Realtime and Hyperlocal transit times.

At the time, Google didn't provide an interface for transit companies to serve updated times to their customers. I created a hyperlocal, always up to date, single purpose app that fulfilled this gap - all in under 24 hours. Here is an article that was written about it.