A list of the best free tools for cybersecurity professionals! Not everything requires expensive third-party software :)
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Database of IP addresses that are associated with malicious activity
Free access to over 20 million threat indicators contributed daily
IP banlist
Real-time certificate transparency log update stream. See SSL certificates as they're issued in real time.
Query and inspect dns records for a domain
Database of public exploits for vulnerabilities
Sandbox files in Windows, Mac, Android, or Linux
MX, DMARC, and other email tools
Database of public vulnerabilities
Opensource vulnerability scanner
Comprehensive Open-Source Email Security Platform
Database of IP devices
Check viruses against 70+ antivirus scanners