Linux has a good range of port scanners that help administrators identify and rectify weaknesses in a system.
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Category: Security
Nibble – local network scanning tool
Nibble is a CLI tool for local network scanning that focuses on speed and ease of use.
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11 Useful Free and Open Source Linux Reverse Vulnerability Analysis Tools
Vulnerability analysis is an essential activity for enterprise security. We recommend useful open source tools.
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8 Best Free and Open Source Network Intrusion Detection Systems
An intrusion detection system is a device or software application that monitors a network or systems for malicious activity or policy violations.
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ddgst – hashing and checksum utility
ddgst is a cross-platform command-line hashing and checksum utility written in the D programming language.
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18 Best Free and Open Source Network Analyzers
A network analyzer (also known as a packet analyzer, packet sniffer, or protocol analyzer) is software that intercepts and logs traffic that passes over a computer network or part of a network.
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5 Best Free and Open Source Frontends for GnuPG
GnuPG is a superb tool though it’s a command line affair. If you’re looking for a GUI frontend, check out these tools.
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14 Best Free and Open Source Vulnerability Detection Tools
Vulnerability scanning is an essential activity for enterprise security. We recommend the best free and open source vulnerability detection tools.
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ZGrab – application-layer network scanner
ZGrab is a fast, modular application-layer network scanner designed for completing large Internet-wide surveys.
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nacrypt – file encryption program
Nacrypt is designed to be safe by design, using secure defaults for all cryptographic operations.
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babyshark – flows-first packet capture TUI
Babyshark is a PCAP TUI that helps you answer: What’s using the network? What looks broken/weird? What should I select next?
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12 Best Free and Open Source Firewall Tools
We recommend free and open source firewall tools.
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nftables – in-kernel packet classification framework
nftables replaces the popular {ip,ip6,arp,eb}tables. This software also provides libnftables.
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firewalld – dynamically managed firewall
firewalld provides a dynamically managed firewall with support for network/firewall zones.
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iptables – configure the Linux kernel and later packet filtering ruleset
iptables is a user space application program that allows a system administrator to configure the Netfilter tables, chains, and rules.
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ufw – manages a netfilter firewall
ufw stands for Uncomplicated Firewall. This is software for managing a netfilter firewall.
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Shorewall – gateway/firewall configuration tool
The Shoreline Firewall, more commonly known as “Shorewall”, is an open source firewall tool that builds upon the Netfilter.
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gufw – manage your firewall
gufw is a graphical user interface for Ubuntu’s Uncomplicated Firewall.
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Vuurmuur – powerful firewall manager built on top of iptables
Vuurmuur is a powerful firewall manager built on top of iptables on Linux. It has a simple and easy to learn configuration that allows simple and complex configurations.
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Exosphere – aggregated patch and security update reporting
Exosphere is a CLI and Text UI driven application that offers aggregated patch and security update reporting.
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