What about other tools like: Open Source PaaSs, Open Virtual Machine Formats, OpenShift, OpenStack, Cloudify, CloudFoundry, Hyper V, KVM, Xen (XCP), Virtual Box, AMI, LXC, OpenVZ, GlusterFS, Ceph, OpenStack Object Storage (SWIFT), Sheepdog, OpenFiler, Provisioning and Monitoring tools, like you said Orchestration/Automation & Configuration Management tools, Cobbler, Spacewalk, Kickstart, others like Cfengine, Cacti/RRDTool, Nagios, Zabbix, Zenoss, Capistrano, RunDeck, Func, MCollective, and others. Then probably choices between choosing the OS: Debian, Fedora, maybe Arch Linux for those that like that.
These, and probably others that I don't know, are the choices that someone, who believes in not pursuing in anything proprietary, that also wants to learn to build an OpenSource IaaS, or PaaS stack for their product- are researching into but cannot find a straightforward guide. Advocating working with OSS, and teaching people how to use OSS tools will lead to more jobs, so keep at it. I subscribed to your email list...