Violet Sans by Violet Office
Initially designed as an all caps display sans-serif, Violet Sans has now a full set of lowercase characters, and ample language support for Latin alplabet based languages.
It was created as a nod to the long tradition of geometric sans-serifs (especially Eurostile).
It’s a modern font, completely free for both personal and commercial use.
If you want to contribute, see Violet Sans Github repository.
OTF, TTF, WOFF, WOFF2
SIL Open Font License → Licenses explained