#2: I displaced the name tag...

This very tiny plant had grown tiny offset since I got it:

#3: tiniest cactus I ever bought, it is in a 1.5" pot. I have only 6 or 7 cacti, but this one looked bit different (maybe only because of size, haha):

the second one for sure a Crassula

I'm really interested to know what #2 is as well, since I have one and I have NO idea what it is or how to search for it XD

Looks little bit like Crassula pellucida marginalis (common name Calico kitten I think), but am not sure...perhaps C. exilis ssp. Cooperi or one of the Picturata hybrids...after searching, I believe the last one :) - Crassula exilis ssp. picturata...

Rina, the molokiniensis is one of my favs, but is difficult for me:). I have not cracked the code yet. Definitely needs more water than an average succulent, and lots and lots of light. Too much h2o the leaves get moldy. You mayhave an easier time tho:).

Oh ya this is obvious, but this plant does not like cool weather. Not even a little. I've killed about 5. I have some now. So I I will keep my fingers crossed:). They're so beautiful when they're big.

3 may be Gymnocalycium mihanovichii, but there's something that looks slightly different on yours:).

I love the Portulaca molokiniensis, Rina! They grow rather fast for a succulent, I thought, and branch out nicely if you top them. I have not had any luck propagating them, though, for whatever that's worth. Unfortunately, I have no idea what the rest is, but I feel envy!