Lots of great fonts and families mentioned so far in this thread, but no-one has mentioned my current and long-time favourite for almost all environments and applications: Input.
$ echo sans serif monospace | xargs -n 1 fc-match InputSansCondensed-Regular.ttf: "Input Sans Condensed" "Regular" InputSerifCondensed-Regular.ttf: "Input Serif Condensed" "Regular" InputMono-Regular.ttf: "Input Mono" "Regular"
Lots of great fonts and families mentioned so far in this thread, but no-one has mentioned my current and long-time favourite for almost all environments and applications: Input.