Nmap (short for Network Mapper) is a free and open-source network security scanner for large networks. It was originally developed by Gordon Lyon (Fyodor Vaskovich) for Linux in 1997, later gradually became one of the most popular network discovery and security auditing tools on multiple operating systems with the participation of many volunteers in the open source community.

Total Network Inventory (TNI for short) was originally an enterprise assets managing and tracking application. But on AppNee's opinion, it is a more interesting app than that - scan and capture the detailed information of all hardware devices (including software) in a local area network (LAN). If were not for this, it would never appear on AppNee.

With the development of mobile devices and network, intelligent mobile phone has become a new paradise for hackers. Imagine, under this environment of everybody holds a smart phone nowadays, nothing is more active than the mobile phone viruses and the vulnerabilities' exploits of software and mobile network. Therefore, to understand and master some practical security tools seems necessary and meaningful.