Why are these plants?

[SMem_jee]

Hey guys what's up! So I was just chillin and this guy was selling plants so i bought some of them,
they looked pretty interesting.. Any guesses on what they might be?

 

[Cosmic Spore]

Picture #2 & #3 look like Aloe vera. Picture #1 I don't have a clue.

 

[ooo0ooo]

I agree re: #2 and #3. Some sort of Aloe for mine, but mine don't have as bigger bumps/spikes on the sides. (Yes, those are the correct botanical terms too, btw...)

0.

 

[Gone-and-Back]

#2 and #3 are definitely some type of Aloe plant.

The first picture looks really familiar, but I am not sure what it is called. I have seem them around in many peoples gardens, but as far as I know they have no special alkaloids or anything like that. Just pretty looking, good for ornamental purposes. I think it might be called a Hostis plant? I think I remember someone referring to it with the name Hostiss...