====== Operation Stacks ======

  * CI/CD
    * Jenkins
    * GitLab CI
    * Docker
      * Kubernetes
  * SCM
    * GitLab
    * GitHub
    * BitBucket
    * Nexus
  * PMS
    * Jira
    * Redmine
  * Environment
    * Cloud
      * AWS
      * GCP
      * Oracle Cloud
      * Azure
    * On-premise
  * Tools
    * Messaging
      * Slack
      * MatterMost
    * CMS
      * Confluence
      * Wiki
    * Notion
    * Trello
    * Asana
  * Monitoring