[zcam]

It's a bit like nix but only for emacs. Modes are downloaded/built locally and versions pinned. From there you can put in version control your pin file and update/revert updates safely. It also guarantees you get the exact same setup across machines.

Paired with use-package it makes emacs configs very compact, typically you can have a single conf file + the versions file for everything related to ones setup. That makes it very easy to transport.

Even if you use nix/guix it's more convenient imho to use straight.el for emacs, as it's standalone as long as emacs is available.