Examples of websites using
MFred
(MFred is a sans-serif font designed by Matt Willey, Dmitry Rastvortsev, and Henrik Kubeland and released by Matt Willey in 2014. The font offers a range of weights and styles for various design needs)
with
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)