JetBrains Mono is a free and open-source, monospaced typeface specifically made for developers. The font has been designed focusing on the problems that can cause eye fatigue during long sessions of working with code.
Typeface comprehends code-specific 138 ligatures, 4 weights (regular, medium, bold and extra bold) with matching italics and supports 143 languages at the time of writing.
This is a great choice to be used in code editors such as Visual Studio Code, PHPStorm, Atom, Sublime Text or more.