Ask the Expert: What kind of succulent plant could this be?

I found these beautiful Aloe-like succulent plants in a friend’s garden and took some of it home.  I’ve planted them in Pots and they’ve grown tremendously.  In Diameter the one on the photo is about 20cm and it prefers shady areas with a little morning sun.  Could you please tell me what their name is? All my friends love them and I gave them the little babies growing from the stem below. They grow easily with little care and water.

Regards
Elzet