Don't wish to be abrupt, but they look rather dying; well the 1st perhaps, not the 2nd.

I don't grow arid land cacti, so I'll skip the 1st plant.

The 2nd is some kind of tropical, Epiphytic cactus, needs light, airy, fast draining mix, bright indirect light. Plants like this often are similar looking & IDs are most reliably made based on bloom. Possibly a form of Rhipsalis or Epiphyllum oxypetallum.

Come over to the Cactus & Succulent Forum nearby (see top of this page) & you can read up on some of these over there.

It's thirsty too, that's why the leaves are curling at their edges.