The winners of the Thrutu enhanced phone call contest all focused on collaboration. The Thrutu API allows developers to create "buttons," applications that can run during a phone call and pass information between the callers. The winner also utilized the Dropbox API to create a file sharing button.
DropThru is a native Android application built as a Thrutu button. It gives users the option of sending a file from Dropbox or the phone's SD card. Though Thrutu supports iPhone, the native buttons don't run on iPhone, of course.
Second place Search and Share is also native and helps users share products with the other caller. Either scan a barcode or search by keyword. Third place, CollPanel (which can be found at Thrutu Central), is a web-based button, which works on either Android or iPhone. It takes the idea of collaborative drawing and adds backgrounds for playing games like Hangman.
There are now 27 Android buttons and 12 iPhone buttons in Thrutu Central. The contest (disclosure: the author was a judge) helped increase the pool of buttons for users, as well as shows great new examples for developers looking to augment phone calls.
We previously provided an overview of Thrutu. And as we mentioned when the Thrutu contest launched, the winnings for this contest came from the Thrutu team's second place finish in PayPal’s Android challenge.