Don't know the first, The second is a Maranta leuconeura, there are some different cultivars. The third is a Dracaena fragrans, there are a number of different cultivars of these as well. The fourth looks like a clump of Parlour Palm (Chamaedorea elegens) seedlings.

1 is Sempervivum tectorum or some similar succulent.

"1 is Sempervivum tectorum or some similar succulent."

Agree. And this is not a houseplant. It is a very cold hardy succulent, rated to as low as zone 3. Would be happiest and form large colonies if planted outside.