1. Ansible

Ansible is an open-source automation platform used for IT tasks such as configuration management, application deployment, and task automation.

2. Terraform

Terraform is an open-source infrastructure as code software tool created by HashiCorp. It allows users to define and provision data center infrastructure using a high-level configuration language.

3. Docker

Docker is an open-source platform used for automating the deployment, scaling, and management of applications inside lightweight containers.

4. Git

Git is a distributed version control system used to track changes in source code during software development. It helps in collaboration, versioning, and maintaining codebase history.

5. Kubernetes

Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications.

6. Jenkins

Jenkins is an open-source automation server used to automate the building, testing, and deploying of software. It supports continuous integration and continuous delivery (CI/CD) pipelines.

7. Helm

Helm is a package manager for Kubernetes, making it easier to deploy and manage applications on Kubernetes clusters using reusable, configurable charts.

8. Linux

Linux is an open-source, Unix-like operating system that is widely used for its stability, security, and flexibility in DevOps environments.

9. Prometheus

Prometheus is an open-source monitoring and alerting toolkit used for event monitoring and alerting based on time-series data.