Generic

Apache | Ansible | Chef | Consul | Git/Github | Jenkins | Splunk | AppDynamics | New Relic | Sumo Logic | Sensu | Nomad | Graphite | Grafana | Packer | Puppet | Saltstack | Tomcat | Javascript | Maven | Neovim | Perl | PHP | Powershell | Python | Ruby | Angular | Terraform | Vault | Veritas

Cloud Platforms

Amazon Web Services | Google Cloud Platform | Microsoft Azure | OpenStack | Redhat OpenShift

Linux

CoreOS | Redhat/Centos | Ubuntu

Unix

HP-UX | Oracle Solaris | IBM AIX

Virtualization - Containers

Docker | Kubernetes | Linux KVM | QEMU | XEN | Vagrant | VMware | Virtualbox