Comment by kdeldycke

I wrote something similar but to keep a local system up-to-date: https://github.com/kdeldycke/meta-package-manager#readme

With Meta Package Manager you can aggregate the results of all package managers available on your machine:

    $ mpm outdated
    ╭──────────────┬─────────────┬─────────┬───────────────────┬────────────────╮
    │ Package name │ ID          │ Manager │ Installed version │ Latest version │
    ├──────────────┼─────────────┼─────────┼───────────────────┼────────────────┤
    │ curl         │ curl        │ brew    │ 7.79.1            │ 7.79.1_1       │
    │ git          │ git         │ brew    │ 2.33.0            │ 2.33.0_1       │
    │ [email protected]  │ [email protected] │ brew    │ 1.1.1l            │ 1.1.1l_1       │
    │ rake         │ rake        │ gem     │ 13.0.3            │ 13.0.6         │
    │ Telegram     │ 747648890   │ mas     │ 8.1               │ 8.1.3          │
    │ npm          │ [email protected]   │ npm     │ 7.24.0            │ 8.0.0          │
    │ pip          │ pip         │ pip     │ 21.2.4            │ 21.3           │
    │ regex        │ regex       │ pip     │ 2021.9.30         │ 2021.10.8      │
    ╰──────────────┴─────────────┴─────────┴───────────────────┴────────────────╯
    8 packages total (brew: 3, pip: 2, gem: 1, mas: 1, npm: 1, apm: 0, cask: 0, composer: 0).

Bonus point: it solves XKCD #1654 (Universal Install Script).

(edit: formatting)