All the titles available in the new MUBI section, MUBI Library. The selection differs depending on the country you're in, like the Now Showing section; this list refers to MUBI: Italy (here you can see the Now Showing list). The films may or may not be available for rent, I'm just listing those which are included in the subscription.
Missing on Letterboxd:
The Fifth Horseman (Enrique Viciano, Rosana Pastor, 2014)
If I'm missing something or there's something that shouldn't be here please let me know in the comments.
UPDATE: added a bunch of Indian films from the Spotlight on India section.