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Bootstrap

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bootswatch preview

https://bootswatch.com/flatly/

http://getbootstrap.com/

https://bootswatch.com/flatly/

FreeText tutorial

Building a Responsive Portfolio with UIkit

Web Design » Frameworks

uikit

http://www.sitepoint.com/building-responsive-portfolio-uikit/

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uikit

Web Design » Frameworks

uikit

http://getuikit.com/index.html

https://www.youtube.com/playlist?list=PL2SfpsC7cy0gv9O7nNKyQZBrFjhi3LH-V

https://twitter.com/getuikit

https://plus.google.com/communities/114238665434626719878

FreeApp

Metro UI CSS

Web Design » Frameworks

https://metroui.org.ua/

FreeApp

Semantic UI

Web Design » Frameworks

http://semantic-ui.com/