#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...
Everything published by Gone-and-Back are the mad rantings and ravings of a mind who yearns to be free and thinks he knows what he is talking about. However, these are just delusions made to feel that freedom, because that freedom will never come. Any experiments done are purely figments of the imagination, and are falsified to the highest degree. Nothing should be taken seriously from a crazy mans mind.