Currently, I am using Montserrat. Even though it is licensed under Open License Font, I do not feel comfortable using it anymore, probably because it is used in over 17 million websites and is considered overused.
Another reason is that I have to load multiple font weights, as bold tags do not work as intended. A single weight is over 20kb in size (after removing unused glyphs). I want to keep my site lightweight, and good looking.