OS
Linux FreeBSD Solaris Windows
Virtualisation
XenServer ESX KVM Oracle VM Solaris Container FreeBSD jails, bhyve
Applications
NetBackup CQ5 Confluence & Jira MySQL Tomcat Asterisk Apache Webserver Drupal
Storage
NetApp (FAS & eSeries) HP EVA & 3PAR IBM DS Brocade & Cisco SAN Switches Quantum & HP Tape Libraries
DevOps
Chef, Puppet, Ansible