PC + laptop: Debian testing (jessie).
File server: Solaris 10 (Multi terabyte ZFS pool FTW (IMG:[
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Application servers: Xen hypervisor (FreeBSD and Debian on it)
Routers: VyOS, Cisco IOS, and Alcatel Lucent SR OS
I haven't used a Windows OS (except to work) for 8 years.
Currently looking for a nice web frontend to go with Xenserver (in Type 1 hypervisor setup), that can manage cleanly high availability. If you know one, feel free to PM me to share what you tested.