Crazyflie is a building platform for makers that are interested in a Quad-copter that they can hack and add special features to. Its a palm size Quad-copter that can be assembled in very little time. It is very small, agile and for less than $200 its amazing value. The video below demonstrates its capabilities…
For more details have a look at Bitcraze , they have a Wiki that covers the design and how to hack it to your needs.
The kit is available from SeeedStudio.
UPDATE : We have an updated article on upgrading the battery for longer flights.