It may be a little early, but Sight & Sound has put out their best of 2015 list. 168 Critics from around the world submitted their top 5 films of the year, and this list includes every film that received at least one vote. See the notes for the number of votes each film received. Since Sight & Sound put the list out a month before the end of the year, there are a few 2014 films on here (and a handful of old films that had a restoration). And movies that haven't been released yet will probably show up on 2016's list.
Not on Letterboxd (or IMDb):
Singularity - Dir. Albert Serra - Spain (1 vote)
Strolling - Dir. Cecile Emeke - United Kingdom (1 vote)
Tomorrow Tripoli - Dir. Florent Marcie - France (1 vote)