Try Fira Sans, A Free Font Family Commissioned By Mozilla
In 2013, the Mozilla Foundation commissioned Erik Spiekermann, a famous typographer, to work on a free, open source font family called Fira Sans (initially called Feura Sans).

Recently, the typeface was updated to version 3.1, getting 12 different weights (bringing the weights number to 16), all accompanied by italic styles, a huge character map and extensive language supports. There’s also a monospaced variant: Fira Mono which includes 2 weights (regular and bold).