Fonts for application on Windows and Linux (The same font may give you different looks on different systems or apps)

Font:
Win: Hack font for Eclipse, Consolas High for others; 
Ubuntu: Monospace regular 
Verdana
Segoe UI (Windows only)
Arial (newer on Windows, Mac) almost =  Helvetica (older, on Mac and Unix)

Monaco on Mac
Menlo on Mac

Input font: Download here: https://drive.google.com/file/d/0B-yP6qGwTd2iNlgybzliakdtdkU/view?usp=sharing

http://www.cssfontstack.com/

My font preference:
Hack > Consolas (depending on apps) > Ubuntu Mono Bront >  Ubuntu Mono or Menlo > Verdana

For different application, even the same font gives you different looks. So different applications use different fonts.

Eclipse on Linux: Hack Regular 9
Eclipse on Windows: Hack font 10
Terminal on Linux: Hack Regular 9
Scite on Linux: Hack,size:9
TextWrangler on Mac: Consolas 13
Scite on Windows: Consolas 11
tkdiff on Linux: DejaVu Sans Mono 10
Cygwin console on Windows: Hack 9

Windows terminal: Ubuntu Mono Bront 11
Emacs on Windows: YaHei Consolas Hybrid