First is crassula cv. gollum some calls it cv. hobbit but I think hobbit is different... but as most the web pictures are wrong labeled because it seems any lord of the rings character name do well... it's hard to tell Second one you may find it as crassula portulacea or crassula ovata. I would say portulaceae Third (veeeeery beautiful) and fifth might be some sort of sedum or sedeveria (hybrids between sedum and echeveria) it would be really hard to get a correct id... Fourth is an haworthia, even harder to tell an exact species... take a look at www.haworthia.com Paul.

Did you mention where you live? (Good idea is to put general location and/or growing zone next to your name...) Yes, Sempervivums could be grown indoors but usually they don't look their best. I am not sure if they are better off with having to spend winter outside (some plants have to have x number of cold days to grow well); unless you get them really good light during winter they usually look quite sad. During summer it may not make that much difference. But amount of light is always less indoors than outdoors. But if you don't have access to garden or deck-balcony, you have to just do it indoors. Many ppl have to, living in apartments without balcony or any other outdoor space. All of the succulents need lots of light otherwise they stretch as I already mentioned about Painted lady. I use lots of supplemental lighting in winter, and probably will improve even more next winter. here is same Echeveria purpusorum, still indoors (March) and blooming, under lights: Adding more perlite definitely helps.

1. Euphorbia mammillaris var. variegata:). 2. Looks like Kalenchoe fedtschenkoi I think.

The third picture is of a "bunny ear" cactus. The scientific name is Optuntia Microdasy. I am unsure of the other two. Regarding the "babies" on the first picture, you may want to leave them alone until you see what they're doing. You can cut them off and try to propagate them. I'm not sure how successful it will be because of their size.