Greenbone (OpenVAS)
Vulnerability management platform behind the widely used OpenVAS scanning engine, from appliance to free edition.
Alternatives
Choose OPNsense if…
- you need multi‑WAN load balancing and automatic failover
- you need an IPS powered by Suricata without extra licensing
- you need a free core under a permissive BSD/MIT license
- you need built‑in support for IPsec, OpenVPN, WireGuard and
- you need NetFlow traffic analytics from the same appliance
Choose OWASP ZAP if…
- you need an intercepting proxy for manual web pentests
- you want zero‑cost DAST that runs in CI/CD pipelines
- you rely on community add‑ons to extend scanning rules
- you prefer a UI designed for developers and newcomers
Choose Tenable Nessus if…
- you need the largest plugin and CVE database available
- you rely on built‑in CVSS v4, EPSS, and VPR scoring
- you prefer a vendor‑supported subscription with regular
- you can justify a paid license for comprehensive risk
Choose Qualys if…
- you prefer a SaaS solution with no on‑prem hardware to
- you need automatic discovery of cloud workloads and
- you want a single platform that combines vulnerability
- you have a dedicated security team to act on continuous
How to Decide
Greenbone (OpenVAS) is best known as an open‑source vulnerability management platform that powers the widely used OpenVAS scanner and is used by security teams and IT admins conducting vulnerability audits. The alternatives split into a few clear camps: Qualys leans on a cloud‑SaaS deployment with continuous automated asset discovery and a unified compliance‑risk platform; OPNsense differentiates with a self‑hosted firewall and routing solution released under a permissive BSD/MIT license that bundles IPS and multiple VPN protocols; Tenable Nessus stands out as an industry‑standard scanner offering a massive CVE/plugin library and multiple risk‑scoring models such as CVSS v4, EPSS and Tenable’s VPR for prioritization.
When comparing these options, focus on (1) the deployment model – whether you need a cloud SaaS service like Qualys, a self‑hosted appliance/firewall such as OPNsense, or a desktop‑app scanner like Nessus; (2) licensing and source availability – open‑source/free editions versus proprietary paid subscriptions; (3) the breadth and freshness of the vulnerability test library – Greenbone’s open feed, Qualys’s continuous cloud updates, or Nessus’s 117 k + CVEs and 319 k plugins; (4) the risk‑scoring and prioritization approach – simple severity tiers in Greenbone, Qualys’s risk‑based scoring across assets, or Nessus’s multi‑model VPR system; and (5) pricing structure – freemium/self‑hosted free tier, contact‑for‑price enterprise SaaS, or subscription‑based licensing – which directly impacts total cost of ownership for your team.
All Alternatives
“Intruder provides cloud‑based continuous vulnerability scanning, matching OpenVAS's core purpose on a SaaS model.”
“OpenVAS/Greenbone delivers open‑source vulnerability scanning similar in scope to ZAP’s web‑app tests.”
“Nessus is a direct commercial counterpart offering the same vulnerability scanning and remediation workflow.”
“Qualys delivers full‑stack vulnerability management and compliance, a direct alternative to OpenVAS's feature set.”
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