Best lightweight CSS framework for simple responsive websites?

I recently ran into Skeleton CSS and loved it. What are your favourite lightweight frameworks?
Santiago PliegoUX Designer | co-founder @ConsignCloud · Asked

10 recommended

Levi BostianI build mobile apps for startups. · Written
Develop, debug, and prototype. Lightweight. Fast. Simple. Helps you to use best practices. Built around basic design concepts. I love it.
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2
Milligram

A minimalist CSS framework

Modern version of Skeleton
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1
Material Design Lite

Kunal Bhatia22Co-founder & Design Lead @SlidesUp · Written
@addyosmani has done a superb job with the Material Design Lite components. Check it out!
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1
PrepBootstrap

Bootstrap themes, templates & widgets with code examples

Suhas MoudgalyaProduct Engineer at EdgeVerve Systems · Written
This one !!!
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1
Pure

Set of small, responsive CSS modules

James Welch3CEO @ innovationcompany.co.uk · Written
I've really enjoyed using purecss.io on my projects and even built it into a CMS tool that I made. It's a lighter option than bootstrap and I find it has 99% of the things I need out of the box.
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1
Spectre.css

A lightweight, responsive and modern CSS framework

I have worked with this framework, its preety lightweight and fast. It has got some amazing components. Highly recommended.
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1
Bulma

A modern CSS framework based on Flexbox

J. Alexander CurtisCo-Founder, OhMyTix · Written
Bulma is slick and responsive. It has tons of elements and is all based on flexbox.
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1
Waffle Grid

An easy to use flexbox grid system.

Lucas GruwezGeek by day, still a geek by night · Written
Lucas Gruwez made this product
Waffle grid is just a simple CSS flexbox grid.
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mini.css is minimal, responsive, easily customizable and the documentation is phenomenal.
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Angelos Chalaris made this product
mini.css is under 7KB gzipped, well-documented, responsive and easy to customize. Give it a shot!
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