For me, Guix. The Guix system and package manager let you really work with your OS in a way that you just can't otherwise. It turns the great cluttered mess of

For me, Guix. The Guix system and package manager let you really work with your OS in a way that you just can't otherwise. It turns the great cluttered mess of files and packages lurking in the typical Linux system into a few clean version-controlled files. It is truly beautiful software on every level.