Monoid
Monoid is a customizable, minimal + legible font optimized for coding. It’s customisable with ligatures, alternates and class based positioning.
19 Alternatives To Monoid
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).
Inconsolata
OSX, Productivity, Design, Typography, powerline, and Fonts
Inconsolata-g
I use the free Inconsolata font (by Raph Levien) to program and as shell font, and I like it a lot.
Java
A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
M+ 1m
Download and install the M+ 1m free font family by M+ Fonts as well as test-drive and see a complete character set.
Pragmata Pro
Monospaced font designed for coding and for engineering. It contents more than 10000 glyphs TrueType handinted for best possible readability at low sizes
Roboto Mono
Making the web more beautiful, fast, and open through great typography