Free
Passwords & IDs · Security
Generate strong, random passwords free from 1Password.
passwordsgeneratorrandom
Browse the complete directory — use filters to narrow down.
Passwords & IDs · Security
Generate strong, random passwords free from 1Password.
Passwords & IDs · Security
Open-source password manager with a free generator and vault.
SSL & TLS · Security
Search certificate transparency logs for any domain.
Headers & CSP · Security
Google's tool to evaluate and debug Content Security Policies.
Secret Scanning · Security
Enterprise secrets detection and remediation platform.
Passwords & IDs · Security
Online GUID/UUID generator with many formatting options.
Penetration Testing · Security
Crowdsourced penetration testing labs and CTF challenges for practicing offensive security skills.
Passwords & IDs · Security
Manage secrets, certificates and encryption centrally.
Passwords & IDs · Security
Check if your email or password has appeared in known data breaches.
Headers & CSP · Security
Mozilla's scanner that grades a site's security headers and config.
SSL & TLS · Security
Diagnose why Let's Encrypt certificate issuance fails for a domain.
SSL & TLS · Security
Generate recommended TLS configurations for many servers.
Reference & Standards · Security
Open Worldwide Application Security Project: standards like the Top 10.
Penetration Testing · Security
Free, in-depth web security training with interactive labs, maintained by the Burp Suite team.
Headers & CSP · Security
Scan any site's HTTP security response headers and get a grade.
Dependency Security · Security
Fast static analysis for finding bugs and vulnerabilities in code.
Dependency Security · Security
Find and fix vulnerabilities in dependencies, containers and code.
Dependency Security · Security
Detect supply-chain attacks and malicious changes in npm and PyPI packages.
SSL & TLS · Security
Deep SSL/TLS server certificate and configuration analysis.
Penetration Testing · Security
Guided, browser-based cybersecurity training with hands-on labs from beginner to offensive paths.
Passwords & IDs · Security
Generate UUIDs/GUIDs in bulk, including v4 and v7 versions.
Reference & Standards · Security
Scan files, URLs and domains with 70+ antivirus engines.
Reference & Standards · Security
Official W3C validator for HTML markup quality.