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HTTD: Apache, Nginx SQL: MySQL, PostgreSQL MAIL: exim, postfix, dovecot, zimbra, open-xchange VIRTUALIZATION: VMware (vSphera, vCloudDirector) KVM (OpenStack, CloudStack, OnApp, Proxmox) CONTAINERS: docker, LXC, OpenVZ CI/CD: Gitlab, jenkins CLOUD: Amazon, Google, Alibaba CaaS: Ansible, Terraform