BLACKBOX MONO BY GABOR KOTHAY
This paragon of fixed-width utility began as a commission for a well known IT company (though it was never deployed, and reverted to non-proprietary status). The typeface has since been expanded by PSY/OPS, and used as a core font in well known web gadgets, but it remains available for general licensing. It comes in coordinated Serif and Sanserif styles, and is favored as a coding font.
The Blackbox Mono fonts include: Western and Eastern European characters, Stylistic Alternates, ligatures, and more.