These are really several different packages; I just group them under “Plumbing”–behind-the-scenes bits that bring everything together and don’t need you to think about them much. Each solves a small problem I ran into enough that I got tired of solving it for every project. They’re all meant to be simple and one-note: Do one thing, and do it well, so you can mix and match as needed.
get_field()
that mostly just adds the ability to get several fields at once–and the ability to provide defaults and run callbacks on those fields individually.