Twenty free and effective infosec tools

We asked readers to name the free tools they find most useful in their daily work as infosec practitioners. Here are 20 that stand out.

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NMap

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Nmap is an open source tool for network exploration and security auditing.

It's built to rapidly scan large networks, though it also works against single hosts. According to the NMap website, the scanner uses raw IP packets to determine what hosts are available on the network, which services those hosts are offering, what operating systems they are running, what types of packet filters/firewalls are in use, and dozens of other characteristics.

"While Nmap is commonly used for security audits, many systems and network administrators find it useful for routine tasks such as network inventory, managing service upgrade schedules and monitoring host or service uptime," the website says.

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