It has been repeatedly asserted by official sources that as of Yoda's passing, Luke is the last Jedi in the galaxy. Of course, in accordance to the Rule of Two, Darth Sidious and Darth Vader are the only Sith in the galaxy, and upon Anakin's redemption, the last.
Besides the three mentioned above, are there any other Force users in the known galaxy at that point in time? Of all the known Force users dating to the Imperial era:
All known Inquisitors have been slain by the end of Rebels Season 2. Is the Inquisitorius still operational? We also have Kanan and Ezra who consider themselves full-fledged Jedi, so with Luke confirmed as the last living Jedi in RotJ the future seems ominous for these two. Maul is not a Sith any longer but he has been slain by Obi-Wan in Rebels Season 3. The witches of Dathomir seem to have been fully exterminated during the Clone Wars and what spirits remained in the mortal realm have been dissipated in Rebels Season 3 as well. The only true unknown at this point is Ahsoka, who seems to have likely survived the fight with Vader as hinted by some official source(s). She does not consider herself to be a Jedi any longer, so the Luke-is-the-last-Jedi issue would not affect her.
So barring the last example, are there any other Force users alive by the time of the Battle of Endor? "Supernatural" beings like the Bendu or the Whills, and Force-sensitives who have not yet learnt to actively utilise their affinity with the Force (e.g. babies) do not qualify. I'm only looking for examples of people who know they are Force-sensitive and have learnt to control it and use it at will. It can either be named individuals or unnamed entities (individuals or groups) whose existence are confirmed nonetheless.