Identification: I need some help Identifying this plant.

Earlier today I became aware that plants were being sold by a sect of the biology department at my college. They had more than they wanted and started selling them. I go this one for free. I asked them what it was, and the professor that game it to me gave me a very scientific name I can not remember. He simplified it to saying "its like an Agave, give it a lot of sun light and water it rarely." That is basically what I wanted to know. However I'm curious to learn more about this plant since I'll be taking care of it for the foreseeable future. Does anyone recognize it?

 

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There are several plants similar to agave that are grown as house plants-- Echeveria, Haworthia, Aeonium and others.

 

I don't know what that is, but it looks like it would need the same care as an agave. In the second image there is a little tiny volunteer (or invader, depending on how you view it) -- a Kalanchoe daigremontiana (Bryophyllum daigremontianum). It makes little baby plants along the leaf edge that drop off to become new plants, thus the common name, mother of millions.