← All website monitoring tools
Open-Source (7 options, 2026)
Self-hosted, code-on-GitHub options. Run on your own server, customize freely, never pay per-site fees.
Most popular free open-source DAST scanner — active/passive web scanning, intercepting proxy, CI/CD integration.
Open-source vulnerability scanner descended from Nessus — free Community Edition, paid appliances for enterprise.
Template-driven fast scanner — community templates cover thousands of CVEs. Free CLI, paid managed cloud.
Long-running open-source web server scanner — checks 6,700+ dangerous files and outdated software.
Standard network discovery + port/service scanner — universal first step for any audit.
Open-source SIEM/XDR with file-integrity, vuln detection, compliance audit modules — also paid Wazuh Cloud.
WordPress-specific vulnerability database + scanner — free CLI with optional API key.
Tips for open-source tools
- Don't run on the same server you're trying to monitor.
- Consider time-cost: free in dollars, not free in maintenance hours.
- Open-source = no vendor lock-in, but you handle backups and updates.