1. Skyfuture company.
https://www.sky-futures.com/
. Accessed 04 Oct 2018
2. Industrialskyworks company.
https://industrialskyworks.com/
. Accessed 04 Oct 2018
3. Cyberhawk company.
https://www.thecyberhawk.com/
. Accessed 04 Oct 2018
4. Airobotics company.
https://www.airoboticsdrones.com/
. Accessed 04 Oct 2018
5. Argos challenge.
www.argos-challenge.com
. Accessed 04 Oct 2018