Guix (and Nix, which came with the whole concept) is a great leap forward in terms of software deployment and sysadmin. It makes it very easy to manage your OS

Guix (and Nix, which came with the whole concept) is a great leap forward in terms of software deployment and sysadmin. It makes it very easy to manage your OS in a very declarative way, with many functional guarantees. Bonus points for being written and hackable in Scheme.