Next:

And lastly, a box of little ones my mother has bought over the past couple of months:

Any ideas?

2nd one is a bit of a mystery...looks like a cross. Seems to have one of more of the following in it: Pachyphytum, Graptopetalum, Echeveria, Sedum. If/when it flowers, please come back & post~might be able to nail it down then.

In your group, the whole back row are Crassula, looks like to me, left to right: C. 'Springtime', C. conjuncta, not sure which Crassula-are the leaves smooth or hairy?, C. arborescens v. undulatifolia.

Front row, l to r, Sedum lineare f. variegata, somewhat like Crassula mesembryanthemoides-but need to see detail pic of leaves, please, Aptenia cordifolia-variegated (might be a named variety).

Also, the third place, back row Crassula's leaves are smooth, but the edges are almost serrated, but too finely to be seen unless one looks very closely.

Other, smooth-leaved one in back could be a form of Crassula nudicaulis. Hard to say, without a closer view. Are there hairs (cilia) on the leaf edges, or a saw-tooth shape (serrated)?