Inter by Rasmus Andersson
Inter (initial name was Inter UI) font family includes 18 styles (9 weights plus matching italics) and a very broad language support with hundreds of glyphs. It was designed for user interfaces, with focus on high legibility of small-to-medium sized text on computer screens.
Has OpenType features like: Contextual alternates (calt), Tabular numbers (tnum), Slashed zero (zero), Fractions (frac), Alternate digits (ss01), Case alternates (case), Localized Forms (locl), Numerators (numr), Denominators (dnom).
You can visit the project’s page or the Inter Github repo.
Inter UI also includes a variable font version.
Update 26 February 2022: Updated to version 3.19
Latin Extended, Cyrillic
OTF, TTF, WOFF, WOFF2
SIL Open Font License → Licenses explained