Our hack is a generic Drone platform capable of Surveillance and Air Quality Monitoring and flies using an autonomous way point navigation system.
It carries a multispectral camera that streams live video which superimposes mission critical flight parameters like attitude, speed, altitude, etc.
We used low cost off the shelf parts like Arduino boards, sensors and XBee modules to build this.
In the next versions we'd add Geiger Counters for radiation monitoring, particulate matter measurement, etc along with a ballistic parachute module that can make the device land safely in case of a free fall or collision.

The components are:
Hexacopter:
> DJI Wookong M Flight Controller
> TMotor MN3515 400kv Motors x 6
> DJI 30A OPTO ESC x 6
> TMotor 15x5 Carbon Fiber Propeller x 6
> Turnigy Nano-Tech 6000 mAh 6 Cell LiPo Battery
> Zenmuse H3-3D Gimbal
> Gopro Hero 4
Environmental Monitoring Module:
> Arduino Uno
> XBee Pro x 2
> DHT11 Temperature and Humidity Sensor
> CO2 Sensor