Computer Modern Typewriter
Created by Donald E. Knuth with the METAFONT font-creation system as a companion to his TeX typesetting system. The letters are parameterized by a total of sixty-two parameters, most of which are independent of each other. (It is, in this sense, more highly-parameterized than any existing Multiple Master font.) Every style—serif and sans serif, monospace and proportional, italic and upright, bold, extended, condensed, and so on—is generated from the same sources, given different parameters.
Later, the fonts were converted to Type1 and TrueType, then eventually OpenType, formats, to integrate with modern operating systems.
The typefaces were developed over a period of time from 1977 to 1985, with minor adjustments thereafter.
The fonts are freely redistributable and usable for any purpose, personal or commercial.