After searching on the web I find then.
For getting all the ip address of the devices connected to my network
nmap -sP 192.168.0.1/24
For getting the OS and more information
nmap -O 192.168.0.0/24
Cool, but what's Project #1 Ubuntu? Well I just thought it will be cool to have a small gadget for getting this information, instead of using the CLI. So the project will consist on developing a gadget for getting this information. I started with Step #1 Get the idea, Now I will begin working on this idea, and let you know how it goes.