3- I can’t see its stems clear enough to be certain. I’m speculating maybe a type of Peperomia ? Perhaps P. maculosa. You know more when it blooms. For now the link below with growing culture for Peperomia plants. If when all these plants bloom and you still don’t know, make new post with photos of flowers. Best wishes! http://www.costafarms.com/plants/peperomia

2- The front plant with spines- looks like a type of Euphorbia in the crown of thorns group (Euphorbia milli), maybe E. milli var. splendens. Link below for more information & growing culture. http://www.desert-tropicals.com/Plants/Euphorbiaceae/Euphorbia_milii.html The one in the back is too blurry to tell, perhaps some kind of Aloe, a succulent plant.

Link for Eve’s needle cactus. http://davesgarden.com/guides/pf/go/57996/

I’m not an expert of any of them and could suggest their possible IDs for you. 1- The one in front with large leaves looks like a succulent in the Crassula group, perhaps C. “Springtime”. Link below will help with growing culture. The plant in the back ground is not too clear to be certain but it could be a type of cactus called : Eve’s needle cactus (Autrocylindropuntia subulata). http://www.cactus-art.biz/schede/CRASSULA/Crassula_cultivar/Crassula_springtime/Crassula_springtime.htm