Freemium
dmarcian
DMARC management platform with free domain and record checker tools
Email and EncryptionDMARC management
Alternatives to MXToolbox
12 tools like MXToolbox, chosen by what they do. About MXToolbox
Open source
Tuta
Encrypted email, calendar and contacts with a free plan
Email and EncryptionEncrypted email and calendar
Open source
VeraCrypt
Free open source disk encryption for Windows, Mac and Linux
Email and EncryptionDisk encryption software
Open source
Cryptomator
Open source encryption for files stored in cloud drives
Email and EncryptionEncrypt cloud files
Open source
Signal
Private encrypted messenger for text, voice and video calls
Email and EncryptionPrivate encrypted messenger
Free
Have I Been Pwned
Check if your email or password appeared in a known data breach
Web SecurityCheck for data breaches
Curated
Detectify
Cloud scanner for exposed assets, APIs and web applications
Web ScanningAttack surface scanner
Freemium
Shodan
Search engine that indexes internet-connected devices and services
Web ScanningSearch engine for devices
Open source
BunkerWeb
Open source reverse proxy WAF that protects web services
Network DefenseOpen source next gen WAF
Free
Let's Encrypt
Free, automated TLS certificates to enable HTTPS on your sites
Web SecurityFree HTTPS certificates
Open source
OpenBao
Open source fork of HashiCorp Vault for managing secrets
Identity and SecretsOpen source secrets vault
Open source
Semgrep
Scans source code and dependencies for security issues
Code SecurityFast code security scanning