Gentoo for most of my personal machines. I currently have about 12 that I use actively (bare metal + virtual).

(Among other things,) I currently use Ceph across 3 servers for storage; Buildah/Podman/Skopeo, LXD, and Libvirt for virtualization; Git for versioning/a simple way to keep certain things in sync; and Saltstack to automate updates.

I have a dedicated virtual machine for building software packages which shares those built packages (currently via Virtiofs) with a LXD instance that exposes them over HTTP for my other machines to download so software only needs to be built/packaged once.

Personally I like and have been using beancount with my own instance of fava. It's text based and may take a bit of getting used to coming from quickbooks, though.