Nessus The Network Vulnerability Scanner

The Nessus^® vulnerability scanner is the world-leader in active scanners with more than five million downloads to date. Nessus features high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Nessus scanners can be distributed throughout an entire enterprise, inside DMZs and across physically separate networks.

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Nmap - Free Security Scanner

Nmap ("Network Mapper") is a free and open source  utility for network exploration or 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.




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Click here to download Nmap for Linux