The Open Source software I use is pretty reliable and on the edge of what technology has to offer. Here is a list of what I currenly am using
I use Jekyll to generate this site
I use Github Pages to host the site
I use Patternfly for my UX/UI
I use FreeIPA for authentication
I use Openstack for my IaaS layer
I use Openshift Origin for my PaaS layer
I use Ceph for my storage
I use Asciibinder for Documentation