Yes, they're generally available in some form (now generally including the ‘originals’ now that V8–V10 have been published). And they're all very simple, which is the whole point of Unix tools.

I've found I'm using the `put`/`take` pair, for splitting a pipeline across shells, more again in the WFH era where I often have multiple ssh sessions into a machine, when I would probably have used the clipboard in a GUI session. Also useful for things like seeing stderr from different parts of a pipeline in different windows. `put` is just `cat >>$(mkpipe "$1")` and `take` is `cat $(mkpipe "$1")` where `mkpipe` is

    fifo="${TMPDIR:-/tmp}/fifo-$(id -u)-$1}"
    test -p "$fifo" || mkfifo "$fifo"
    echo "$fifo"