Devicon

Devicon is an open-source set of icons for programming languages, design tools and developer tools, usable as an icon font or as SVG code pasted straight into a project. Most logos come in several versions, such as plain, line, original and wordmark, with coloured variants, and the site generates the exact markup for each choice. The quick setup panel is the place to start: pick a logo and version, and it writes the stylesheet link and markup to paste.