There's
Nyx which has been free for about fourteen years now, but you do have to register and send in proof of identity and the person handling the validations usually takes about four to eight weeks to process it.
Nyx is pretty much completely frill-free and hasn't changed a whole lot since the old days (apart from adding things like webspace when the whole www thing took off and updating the hardware several times). No custom domain hosting and it's limited to non-commercial (personal, research, charitable) use, but external linking to graphics is allowed and there are no ads, pop-ups, or anything else stuck into your webspace apart from what you put there.