Agnitum Outpost Security Suite Pro is a robust, comprehensive Internet security solution that protects against a broad range of threats; from viruses and spyware to rootkits and botnets. Besides, with the full-featured Outpost Internet security suite you can enjoy downloading, emailing, chatting, sharing files and other online activities without worry. The new version 7.5 with minimal resource consumption features greater malware detection accuracy with updated antimalware engine, enhanced inbound and outbound firewall to keep all connections secure, and improved Proactive Protection to preemptively block unknown and zero-day threats.
Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts.
Flexible: Supports dozens of advanced techniques for mapping out networks filled with IP filters, firewalls, routers, and other obstacles. This includes many port scanning mechanisms (both TCP & UDP), OS detection, version detection, ping sweeps, and more. See the documentation page.
Powerful: Nmap has been used to scan huge networks of literally hundreds of thousands of machines.
Easy: While Nmap offers a rich set of advanced features for power users. Both traditional command line and graphical (GUI) versions are available to suit your preference. Binaries are available for those who do not wish to compile Nmap from source.