Like the Valeyard, the War Doctor and the Fugitive Doctor?
Wikipedia has a navbox for the Incarnations of the Doctor with a list of them.
Pinging the Usual Suspects: @Agiletek @GentlemensDame883 @Goo Monster @HeneryVII @HornyLikeIAmA14YearOldGirl @Lequinni @RivetVermin @Umbire the Phantom @Utini501 @Jlaw @Labster @Looney Toons @GethN7 @Robkelk @QuestionableSanity @Derivative @SelfCloak