{namespace sg = TYPO3\CMS\Styleguide\ViewHelpers}

twbs/Boostrap

Since TYPO3 Sept 2014 twbs/Bootstrap is included in TYPO3 CMS backend.
Also the Bootstrap CSS documentation is included in EXT: styleguide.

Normalize

Since TYPO3 version 6.2 Normalize.css is included in the TYOP3 CMS core.
Normalize.css is a project by Nicolas Gallagher, co-created by Jonathan Neal.
Source code available on GitHub: necolas/normalize.css. Thank you!

clearfix

Clearfix is included since TYPO3 6.2. Thank you!

Einstein Quotes

Albert Einstein quotes collected by kind people at http://en.wikiquote.org/wiki/Albert_Einstein