We recommend free and open source firewall tools.
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Category: Security
20 Best Free and Open Source Steganography Tools
Conceal messages in other messages.
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PixelSafe – graphical steganography utility
PixelSafe is a graphical steganography utility that hides data inside PNG images using the Least Significant Bit (LSB) technique.
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XDP Firewall – stateless firewall tool
XDP Firewall is a stateless firewall that uses eBPF and attaches to the Linux kernel’s XDP hook for high-performance packet filtering.
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zsteg – detects steganographically hidden data
zsteg is a command-line tool that detects steganographically hidden data in PNG and BMP image files.
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StegoVeritas – command-line steganography analysis tool
StegoVeritas is a command-line steganography analysis tool.
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Aletheia – detect hidden messages in digital images
Aletheia is a command-line toolbox for detecting hidden messages in digital images. It uses machine learning.
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FirewallFabrik – graphical firewall policy management tool
FirewallFabrik is a graphical firewall policy management tool and modern successor to Firewall Builder.
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AperiSolve – web-based steganalysis platform
AperiSolve automates the examination of images for concealed data.
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Hermes Secure Email Gateway – secure email gateway and mail server
Hermes Secure Email Gateway is a secure email gateway and mail server that protects email against spam, viruses, and malware.
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mcpsnoop – transparent proxy and terminal interface
mcpsnoop is a transparent proxy and terminal interface to inspect the real Model Context Protocol traffic between AI clients and MCP servers.
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12 Best Free and Open Source Host-Based 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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Tracee – runtime security and observability tool
Tracee is a runtime security and observability tool that uses eBPF to monitor system and application behaviour.
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Hades – host-based intrusion detection system
Hades is a host-based intrusion detection system (HIDS) that uses eBPF and the netlink process connector to monitor activity on Linux systems.
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8 Best Free and Open Source Web Application Firewalls
A web application firewall (WAF) is a type of application firewall that lets you see and analyze HTTP traffic to and from a web application. We recommend our favourite WAFs.
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UUSEC WAF – high-performance web application firewall
UUSEC WAF is a high-performance web application firewall and API security gateway. It uses machine learning and semantic analysis.
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SafeLine – self-hosted web application firewall
SafeLine is a self-hosted web application firewall (WAF) and reverse proxy designed to protect web applications from attacks and exploits.
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7 Best Free and Open Source Passive OS Fingerprinting Tools
Passive OS Fingerprinting Tools rely on sniffing techniques to analyze the information sent in normal network traffic.
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privacyIDEA – open source MFA platform
privacyIDEA is an MFA platform that helps secure applications and infrastructure with additional authentication factors.
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knock-rs – port-knocking implementation
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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