JavaScript Libraries:

Rainbow by Craig Campbell
  * https://github.com/ccampbell/rainbow
  * Apache License, Version 2.0

Rainbow.linenumbers.js by Blender3D
  * https://github.com/Blender3D/rainbow.linenumbers.js
  * Apache License, Version 2.0

Dropdown Menu by Oliver Gast
  * http://www.olivergast.de/blog/2012/04/18/css3-dropdown-menu/
  * (update in http://www.olivergast.de/blog/2015/05/12/css-ein-horizontales-dropdown-menue-reloaded/)
  * No specific license, download states "download for free usage"
