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.
Inconsolata - OSX, Productivity, Design, Typography, powerline, and Fonts
Mononoki - A new and improved version of monoOne by Matthias Tellen. More information here.
Bitstream Vera Sans Mono - Bitstream Vera Sans Mono Font | dafont.com