SF Mono - Use the SF Mono font in Atom by importing it from Terminal.app
Operator - Looking for something? Make a request and we'll find it.
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.
Bitstream Vera Sans Mono - Bitstream Vera Sans Mono Font | dafont.com
Noto Mono - OSX, Typography, Fonts, Design, and powerline
Liberation Mono - Liberation Mono is a font family showing compatibility for metrics with Courier New, Times New Roman, and Arial.