Source Code is a monospace font. It goes well with Jaapokki, Didot, Playfair Display, Montserrat, Skippy Sharp, Proxima Nova, Museo Slab and DIN Engschrift. If you're thinking about using Source Code then try Give 18px a shot for content.
People commonly tag it as portfolio, agency, design, code, coding, api, developer, annotated, pen and learning. You can get it from Adobe Fonts, Font Squirrel, Google Web Fonts and Typekit.