Frenchy, take a look at Echeveria purpusorum.
Your last two plants look like Faucaria and maybe Haworthia? Second one doesn't ring any bells to me.
On the subject of smallest plants, here is a crown of thorns volunteer seedling that I recently separated from the pot where it sprouted. This is the first time it has flowered.
And some Dudleya volunteers, mostly D. brittonii but with some hybrids and maybe one or two other species. Even this early on those differences are apparent.
Take a look at the plants at (using the clock system) 2:30, 6:30, and 7 o'clock. Almost all the other Dudleyas here (but not the parent of these seeds) are powder dusted and that feature is transmitted to the hybrids.
