Most of the software I use on daily basis are Free and Open Source.
I’m running Debian Stretch on both my Laptop and Home server. My Raspberry Pis are powered by Raspbian Stretch Lite (Headless). I have a cloud server running Debian at Linode. I have a couple of Virtual Machines on my Home server powered by KVM, running Debian Stretch and Archlinux.
I’m using i3 Window Manager standalone, which is a tiling window manager for X Window System which nicely utilises the screen. I spend most of my time in rxvt-unicode(urxvt) inside a tmux session. I use quite a lot of command line based utilities like moc, ranger, pass et cetera. I like Vim a lot and always have at least one Vim instance open and I do all text editing in Vim. For browsing the web I use Google Chrome browser. Thunderbird is my email client and I use a very popular Enigmail extension to sign/encrypt/decrypt my emails using GPG key.
I run a local DNS Server on Raspberry Pi powered by BIND 9 which combines Google’s Public DNS with that of Opennic and resolves local domains. And as I run multiple machines locally (Physical and Virtual) which runs web servers, I have Nginx Proxy setup on Raspberry Pi which forwards web requests. Raspberry Pi also runs a ddclient, which is dynamic DNS client. I run several Docker containers on my Home server. I use Cgit on my person Git server.