Quattrocento Sans by Pablo Impallari is a free humanist sans serif with classical proportions and gently changing stroke widths. Softly tapered curves keep the lettering from looking mechanical.
In publishing, its measured shapes suit book covers and cultural magazines, with enough distinction for exhibition posters and literary event graphics as well. The subtle flare and calligraphic modulation echo traditional inscriptional lettering, making it especially apt for museum identities and arts programming.