12 Free Tenable.cs Alternatives Ranked by Real Users (2026)

What is Nessus?

Nessus is a vulnerability scanner of its kind, giving user a complete picture of organization's security status. Instantly scan thousands of systems for the latest vulnerabilities and react to them in real time. Nessus modular architecture and the industry's most flexible licensing make it an ...

What is Microsoft Threat Vulnerability Management?

Microsoft Threat Vulnerability Management is an enterprise software solution enabling IT to monitor the organization's Windows (operating system and application) assets, detect and remediate threats, and deliver asset data to security information and event management (SIEM). Through this ...

What is TAC Security?

TAC Security is a revolutionary vulnerability and risk management platform designed to help forward-thinking security businesses efficiently manage their security operations. With a comprehensive view of your organization's vulnerabilities and risks, it generates informative cyber risk ratings ...

What is Qualys Cloud Platform?

Qualys Cloud Platform provides continuous, round-the-clock monitoring, visualization and assessment of IT infrastructure, security, and compliance, with up-to-date understanding of assets possible in just two seconds. Using automated threat prioritization, patching, and other response tools, ...

What is Spacelift?

Spacelift is a CI/CD and collaboration platform for infrastructure-as-code — providing a managed orchestration layer for Terraform, OpenTofu, Pulumi, Ansible, and Kubernetes. It handles the operational challenges of IaC at scale: parallel stack execution, dependency management between stacks, ...

What is Terramate?

Terramate is an open-source IaC orchestration and code generation tool that adds a layer of automation on top of Terraform and OpenTofu. It detects which stacks have changed and runs Terraform commands only on affected stacks — dramatically reducing plan and apply times in large monorepos with ...

What is OpenStack?

OpenStack's modular, code-driven architecture is designed for massive scalability with thousands of compute nodes; a robust, API-driven feature set that enables the creation, sharing, and management of public and private clouds; and an active community of vendors who are powering the OpenStack ...

What is CloudBolt?

CloudBolt Cloud Management PlatformTM is software that automates cloud resource provisioning, deployment, and administration. It allows using one private cloud to manage multiple public clouds through its special connector technology, which seamlessly extends AWS, OpenStack, and Google Cloud ...

What is Cloudify?

Cloudify is an open-source cloud management platform for the enterprise, providing a robust and easy-to-use software solution for enterprises to manage all of their private, public and hybrid clouds. The Cloud Management Platform enables organizations to save costs, to increase business ...

What is Densify?

Densify is a cloud resource optimization platform for IT operations and FinOps teams managing multi-cloud or hybrid infrastructure at scale. It analyzes historical workload data to generate rightsizing recommendations for cloud instances and containers, reducing spend without degrading ...

What is HashiCorp Terraform?

HashiCorp Terraform is the perfect solution to automate infrastructure across any cloud. With its intuitive platform, it can version, alter and provision resources in a secure environment. Enterprises can dramatically speed up business processes, lower risk and become more efficient when cloud ...

What is Apache CloudStack?

Apache CloudStack is a cloud management platform that makes it easier to build, deploy, and operate private clouds. CloudStack is an open source software for automating datacenter provisioning, management, and orchestration. It separates compute resources from the datacenter fabric so those ...