Stuff that isn't completely terrible.
I host this site on Google App Engine, because it is free and I am cheap. I previously used Digital Ocean, where I self-hosted mail, LAMP, and XMPP. I also use Azure for some of my projects.
I've previously built e-commerce sites with Shopify.
I self-host Gitea. Public projects get mirrored to GitHub.
I also use Fossil. It does everything, and varity is the spice of life.
I spend the majority of my time in Emacs.
OS X for desktop, Debian or OpenSUSE for servers.