Bower – A package manager tool. Allowing you to install and manage packages along with dependencies. As a bonus, you will also get the following useful tools bundled with Bower:
Font-Awesome – Using a huge library of font icons instead of images across your site is the most optimised. Instead of downloading separate images, font awesome provides a library of read made icons. They are also super sharp retina and you can change the size and colours without taking a extra hit on file weights. Also integrated with Sass.
jQuery – jQuery version 3 ready to be used and minified
featherlight – Do you want popups on your site? This is the lightest library around and also responsive. Wide variety of options and easy to theme
slick-carousel – Most sites have carousels in one form or another. Slick carousel is extremely light, responsive and considers accessibility.