the last one looks like a leaf from some type of Geranium I've seen.
I'm curious about the second to last picture as well. I've got that near my place.
The first one is purselane. Its edible, but high in oxalates and shouldn't be fed too often. Don't know the second one, but it looks familiar and may come to me later. The third one is mallow, and is edible.
I am rethinking that first one again.. It could be Elephant Bush Plant or Portulacaria afra. If yours doesn't have flowers then this is what I think it is. If it has flowers then it is either Purslane or Moss Rose