I got this plant from a colleague couple of years ago and she said she didn't know how it was called, supposedly "stag horns" or something, but it's definitely not stag horn fern.
It can grow really large, and quickly: a bit I gave away for the office grew the height of the window on the sill of which it is placed: all within a year.
This is a really great and low maintenance plant and i give away cuttings to friends, so it would to know what it is... Searched for succulents and descriptions in google but nothing came out.