ETC Trispace is a free font family designed by Tyler Finck, where all glyphs occupy one of three possible widths. It is based on League Mono (also designed by Tyler) but with the difference that includes lots of changed glyphs and it’s not monospaced.
Now ETC Trispace is free to download and includes 45 styles (9 Regular, 9 Condensed, 9 Narrow, 9 Wide, 9 Extended with weights from Thin to Black and matching italics) plus a variable font.
You’d need to subscribe the author newsletter to download the font.
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