This is not Aloe africana, which is an unspotted tree aloe. Do you know what it might be? A flower picture might help with that. It can be really hard to tell spotted aloes apart without one, sometimes even with one. In the meantime I would like to propose that this image be moved to the generic aloe listing, along with the other two photos (of buds and fruit) which I would assume are the same plant.
Please let me know what you think.