MonoLisa is a new coding-focused font by Marcus Sterz:

As software developers, we always strive for better tools but rarely consider font as such. Yet we spend most of our days looking at screens reading and writing code. Using a wrong font can negatively impact our productivity and lead to bugs. MonoLisa was designed by professionals to improve developers’ productivity and reduce fatigue.

I’m still partial to Operator from Hoefler & Co, but MonoLisa looks very well done.