Inter is a free, open-source sans-serif typeface designed by Swedish designer/programmer Rasmus Andersson. It was designed to work well on screens as a UI font and features a large x-height. Inter is an incredibly useful typeface that works well as both a display typeface as well a body text.
The family is available in nine weights with matching italics, as well as a variable font version. Inter is 100% free for personal projects and commercial use.