Examples of websites using
Avenir
(Avenir is a sans-serif font designed by Adrian Frutiger and Nadine Chahine, released by Linotype in 1988. It features clean and modern letterforms and is available in multiple weights and styles)
with
Roboto
(Roboto is a sans-serif font designed by Christian Robertson and published through Google. The font family consists of 12 styles, including regular, italic, bold, and bold italic variations)