Your first cactus is a Mammillaria, as is the second. Your unknown plant is Crassula muscosa. Your smooth plant is not a cactus but a stapeliad of some kind. They make smelly flowers that attract flies and your little miniature aloe-shaped plant is Haworthiopsis. It won't grow larger than that but will grow in a column
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muchísimas gracias por tomarte el tiempo de explicarme el nombre de mis plantas y gracias por pasar por mi publicación también