I have these succulents and I don't know their name. The big one on the left is Haworthia attenuata, but the small ones are a mystery to me. Usually their leaves are curved upwards, but now are downwards because of the lack of light. I think they might be a species of Sempervivum, although I don't know which one.
[![enter image description here][1]][1]


Below are the upper leaves of Haworthia
[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/Dc2Tx.jpg
  [2]: https://i.sstatic.net/9wSyA.jpg