UAV (Unmanned Aerial Vehicle) which is also called as the drone is the best example of Swarm intelligence market which widely adopted by many countries especially in the military field.
In the link provided below, they have used it to detect and identify pollution in ports and other aquatic areas. If you are interested you can read further on it, I think you will find it interesting...
There are an interesting in films making by Utilising swarm Intelligence:
The lord of the ring made use of swarm technology for rendering, realistically depicting the movement of a group of soldiers, known as Massive, During battle scenes.