A very good article by Ivaylo Gerchev showcasing top 5 front-end frameworks for 2014 which are Bootstrap, Foundation, Semantic UI, Pure and UIkit. The most popular as everyone knows are Bootstrap and Foundation. Below is the comparison table for both front-end framework. For a closer and more technical look at Bootstrap vs Foundation comparison, check out this article.
|Creators||Mark Otto and Jacob Thornton||ZURB|
|Popularity||77,000+ stars on GitHub||19,200+ stars on GitHub|
|Core concepts/principles||RWD and mobile first.||RWD, mobile first, semantic.|
|Framework size||145 KB||326 KB|
|Preprocessors||Less and Sass||Sass|
|Icon set||Glyphicons Halflings set||Foundation Icon Fonts|
|Extras/Add-ons||None bundled, but many third-party plug-ins are available.||Yes|
|Unique components||Jumbotron||Icon Bar, Clearing Lightbox, Flex Video, Keystrokes, Joyride, Pricing Tables|
|Documentation||Good.||Good. Many additional resources are available.|
|Customization||Basic GUI Customizer. Unfortunately you need to input the color values manually, because there is no color picker available.||No GUI customizer, only manual customization.|
|Browser support||Firefox, Chrome, Safari, IE8+ (you need Respond.js for IE8)||Chrome, Firefox, Safari, IE9+; iOS, Android, Windows Phone 7+|
At the end of the article Ivaylo also added an informative little guideline on the things to consider when choosing a framework to work with. Hit the button below to see the full comparison.