"Alternative to homebrew (the CLI utility)" -> "Frontend to Homebrew (the package system)".

Along these lines, I wonder when somebody will come up with a "universal package manager" that factors out the dependency resolution, content-addressable store, packing / unpacking, file manipulation, signatures, etc. Small plugins, maybe just declarative descriptions, would suffice to connect it to stores like npm, homebrew, pypi, maybe even cargo and nixpkgs.