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Category: Security

Passive OS Fingerprinting

7 Best Free and Open Source Passive OS Fingerprinting Tools

July 5, 2026 Steve Emms Roundup, Security

Passive OS Fingerprinting Tools rely on sniffing techniques to analyze the information sent in normal network traffic.

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Intrusion Prevention - SSH

privacyIDEA – open source MFA platform

July 3, 2026 Steve Emms Security

privacyIDEA is an MFA platform that helps secure applications and infrastructure with additional authentication factors.

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Intrusion Prevention - SSH

knock-rs – port-knocking implementation

July 3, 2026 Steve Emms Internet, Security

knock-rs is a port-knocking implementation written in Rust that detects SYN packets rather than listening on the protected ports.

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Intrusion Prevention - SSH

Brute Force Detection (BFD) – log-based security tool

July 3, 2026 Steve Emms Security

BFD is a log-based security tool that detects authentication failures and automatically bans hostile IP addresses on Linux servers.

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Intrusion Prevention - SSH

endlessh-go – SSH tarpit

July 2, 2026 Steve Emms Security

endlessh-go is an SSH tarpit that slowly sends an endless SSH banner to clients, tying up bots and brute-force attackers.

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Passive OS Fingerprinting

MuonFP – enterprise-ready passive TCP fingerprinter

July 1, 2026 Steve Emms Security

MuonFP identifies and classifies network traffic from TCP packet characteristics.

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Passive OS Fingerprinting

Leetha – passive network fingerprinting and analysis engine

July 1, 2026 Steve Emms Security

Leetha is a passive network fingerprinting and analysis engine.

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Intrusion Prevention - SSH

IPBan – detects repeated failed logins

June 29, 2026 Steve Emms CLI, Internet, Security

IPBan is security software that detects repeated failed logins and automatically blocks offending IP addresses.

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Security

13 Useful Free and Open Source Linux Forensics Memory Tools

June 13, 2026 Steve Emms Roundup, Security

This roundup focuses on memory tools that help with forensics. Only free and open source software is eligible for inclusion here.

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Security

PCILeech – security research and memory acquisition tool

June 12, 2026 Steve Emms Security

PCILeech is a security research and memory acquisition tool that uses Direct Memory Access over PCIe to read and write target system memory.

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Security

LeechCore – physical memory acquisition library

June 12, 2026 Steve Emms Security

LeechCore is a physical memory acquisition library aimed at digital forensics, incident response, and low-level security research.

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Security

emd – command line memory acquisition tool for Linux systems

June 11, 2026 Steve Emms CLI, Security

emd is a tool designed to dump physical memory using an eBPF filter, providing a way to capture system memory.

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Security

LEMON – memory acquisition utility

June 11, 2026 Steve Emms Security

LEMON is a memory acquisition utility for Linux and Android systems.

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Security

mquire – Linux memory forensics and analysis tool

June 11, 2026 Steve Emms Security

mquire is a Linux memory forensics and analysis tool for querying kernel memory dumps using SQL.

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Server

5 Best Free and Open Source Linux Network Authentication Tools

June 6, 2026 Steve Emms Internet, Roundup, Security, System Software

Remote Authentication Dial In User Service (RADIUS) is a networking protocol that offers centralized connection authentication, authorization, and accounting management for various types of network access.

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Security

8 Useful Free and Open Source Security Testing Software

June 3, 2026 Steve Emms Roundup, Security

Here’s some useful software for performing security testing. Only free and open source software is eligible for inclusion here.

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Security

8 Best Free and Open Source Secrets Management Software

June 3, 2026 Steve Emms Roundup, Security

Secrets management tools let you securely store, manage, and monitor sensitive information like passwords, API keys, and certificates.

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Security

Sealed Secrets – one-way encrypted secrets

June 2, 2026 Steve Emms CLI, Security

Sealed Secrets is a Kubernetes security tool that lets you encrypt Secret manifests into SealedSecret resources.

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Security

Commix – Python-based penetration testing tool

May 31, 2026 Steve Emms Security

Commix is a penetration testing tool that automates the detection and exploitation of OS command injection vulnerabilities.

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Security

Dalfox – command-line security tool

May 31, 2026 Steve Emms CLI, Security

Dalfox is a command-line security tool for identifying cross-site scripting vulnerabilities in web applications.

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