The four cacti are Mammillaria, except the second, which I think is a young Echinocactus grusonii. The third is M. decipiens camptotricha.
the aloe.. I think so is aloe jucunda.. may be an hibrid.. the second it`s a bromelia specie.. the third look like mammillaria karwinskiana nejapensis.. (check on my flickr account to see more details).. the fourth it`s an echinocactus grusonii (asiento de suegra).. fifth: mammillaria camptotricha an the sith look like mammillaria sheldonii..