Free & Open Source Security Tools
Discover community-driven and free security solutions. Complement your enterprise stack with zero-cost tools.
Browse 2,791 free & open source security tools tools
FEATURED
OPEN SOURCE
CLI tool for threat modeling and visualizing AI agent workflows
HexPrism is a fast, privacy-first hex editor built for CTFs and digital forensics.
HexPrism is a fast, privacy-first hex editor built for CTFs and digital forensics.
iOS privacy sandbox with anti-fingerprinting, encrypted storage, and P2P comms
iOS privacy sandbox with anti-fingerprinting, encrypted storage, and P2P comms
Tech & security blog covering monitor reviews, antivirus, and enterprise software.
Tech & security blog covering monitor reviews, antivirus, and enterprise software.
Dark web threat intelligence platform for detecting & investigating cyber threats.
Dark web threat intelligence platform for detecting & investigating cyber threats.
DNSBL of end-user IP ranges that should not send email directly to MX servers.
DNSBL of end-user IP ranges that should not send email directly to MX servers.
SCA tool for detecting OSS vulnerabilities and license risks in dependency trees.
SCA tool for detecting OSS vulnerabilities and license risks in dependency trees.
Free SCA tool for open source projects with vuln scanning & SBOM.
Free SCA tool for open source projects with vuln scanning & SBOM.
Free web questionnaire assessing org Zero Trust readiness vs. CMMC/NIST standards.
Free web questionnaire assessing org Zero Trust readiness vs. CMMC/NIST standards.
Open-source private CA toolchain for automated X.509 & SSH cert mgmt.
Open-source private CA toolchain for automated X.509 & SSH cert mgmt.
MPC-based 2FA MetaMask Snap for distributed self-custodial wallets.
MPC-based 2FA MetaMask Snap for distributed self-custodial wallets.
DHS-funded program providing automated AppSec tools across the SDLC.
DHS-funded program providing automated AppSec tools across the SDLC.
Free Windows tool for permanent file/disk erasure using overwrite algorithms.
Free Windows tool for permanent file/disk erasure using overwrite algorithms.
Free mobile app for MFA via push notifications, TOTP, and QR codes.
Free mobile app for MFA via push notifications, TOTP, and QR codes.
Auth platform with passwordless sign-in and private AI infra for apps.
Auth platform with passwordless sign-in and private AI infra for apps.
Free threat intel feed blocking malicious IPs/domains via global sensors.
Free threat intel feed blocking malicious IPs/domains via global sensors.
Free AI-powered tool to verify authenticity of images, videos, people & claims.
Free AI-powered tool to verify authenticity of images, videos, people & claims.
AI-powered tool that grades vendor security questionnaires against CIS, ISO, NIST.
AI-powered tool that grades vendor security questionnaires against CIS, ISO, NIST.
Scans and catalogs AI agent skills/plugins for security vulnerabilities.
Scans and catalogs AI agent skills/plugins for security vulnerabilities.
Open-source CLI tool to map, threat-model, and secure AI agent workflows.
Open-source CLI tool to map, threat-model, and secure AI agent workflows.
Agentless web security monitoring for client-side threats and third-party risks.
Agentless web security monitoring for client-side threats and third-party risks.
Dutch ICT learning platform with free & premium tutorials on cybersecurity.
Dutch ICT learning platform with free & premium tutorials on cybersecurity.
Open-source CLI tool for privacy code scanning and data flow analysis.
Open-source CLI tool for privacy code scanning and data flow analysis.
Free website scan for privacy compliance, consent, and 3rd-party data flows.
Free website scan for privacy compliance, consent, and 3rd-party data flows.
