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