Fira Code - A font derived from Fira Mono with added ligatures.
Input Mono - Multiform monospace font.
Noto Mono - OSX, Typography, Fonts, Design, and powerline
Inconsolata - OSX, Productivity, Design, Typography, powerline, and Fonts
Operator - Looking for something? Make a request and we'll find it.
DejaVu Sans Mono - This open source font family is derived from the Bitstream Vera family, itself close to the Microsoft core Web fonts (see Andale Mono).