Free
Have I Been Pwned
Check if your email or password appeared in a known data breach
Web SecurityCheck for data breaches
Alternatives to Let's Encrypt
12 tools like Let's Encrypt, chosen by what they do. About Let's Encrypt
Open source
Zed Attack Proxy (ZAP)
Free open source scanner for finding security flaws in web apps
Web SecurityFree web app scanner
Open source
Freemium
ZeroSSL
Free SSL certificates with ACME, REST API and 90-day renewal
Domains & SSLFree SSL certificates
Free trial
HashiCorp Vault
Stores and controls access to secrets, keys and certificates
Code SecuritySecrets management
Open source
Certbot
Free tool that gets and renews Let's Encrypt HTTPS certificates
Domains & SSLAutomate Lets Encrypt certs
Open source
testssl.sh
Command line tool that tests TLS and SSL server configurations
Web ScanningCommand line TLS tester
Open source
Sigstore
Open source tools for signing and verifying software artifacts
Cloud SecuritySign and verify software
Curated
Checkmarx
Enterprise platform that scans code for security flaws and risks
Code SecurityEnterprise code security
Open source
Cryptomator
Open source encryption for files stored in cloud drives
Email and EncryptionEncrypt cloud files
Free
OWASP Foundation
Nonprofit hub for free application security projects and standards
Security LearningOpen web security community
Freemium
SonarQube
Checks code quality and security in every change, human or AI
Code SecurityCode quality and security