MacPaw Fixel is a free, variable,
unique grotesque with a human touch.
Again, again, Oliver made me aware with his font friday, which was about Fixel this time. Fixel has interesting stylistic alternates, and, as Oliver is pointing out:
Compared to Neue Helvetica, the apertures of e and a of Fixel are more open. The typeface is also wider and seems softer. The alternates are activated with CSS
font-feature-settings: "salt", "ss01"; Fixel is available in a display style and in a text style.