CSS Flexbox is the new part of css3 it allows you to create super complex and super flexible layout with CSS.  When you work with responsive web design, you will find yourself with a combination of floats, heights swell as any number of hacks to get things done. 

CSS Flexbox aims to get rid of these hacks and let us create flexible layouts.  CSS Flexbox controls the position, size and spacing of elements about their parent elements and each other.  By using flexbox css, we can quickly build complex layouts like navigations bars and menus, grid layouts, bar charts and more. 

Even though the browsers do not entirely support flex box, people are started using flex box.  It is excellent idea to keep fallback options like moderniser. 

In this post, you can see a great resource of flexbox tools, cheat sheets, reference, frameworks and much more. 

Flexbox Based Frameworks

mini.css

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Basis

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Grd

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Tent CSS

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Spectre.css

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Wire

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Bulma

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Structure

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Juiced

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BobScss

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Flex Grid Framework

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Milligram

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cssPlus

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Semantic UI

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Mobi.css

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MyLayout

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Flexbox Framework

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Flexbox Grid Systems

RolleiFLEX

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Waffle Grid System

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Gridder

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Flexbox Grid

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sGrid

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Super GiGi

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flex_e_ble

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Gridtacular

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Batch

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Gridlex

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sGrid

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Better Flex Grid System

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EZPZ Flexbox Grid

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Flexo

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Feather Flex

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Flexbox Grid

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Reflexbox

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flexgrid.css

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Flexbox Grid System

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Flexbox Grid Less

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Gridy

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Flexbox Grid

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Flex

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Build with Flexbox

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Flex Layout Attribute (FLA)

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Flexy Boxes

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Flexplorer

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Fibonacci

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Flexbox in 5 minutes

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Flexbox App

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Flexbox Froggy

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Flexbox Defense

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Properties for the flex container

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CSS3 FlexBox

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CSS Flexbox Please

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Flexbox Playground

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Flexbox.less

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CSS Flexbox

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Flexbox Tester

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CSS Flexbox snippets for Sublime

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Flexibility

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Test CSS Flexbox Rules Live

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Flexie

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Flexbox Patterns

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CSS Flexbox snippets for Atom

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Flexbox Cheatsheets

Flexbox Cheatsheet

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The Ultimate Flexbox Cheat Sheet

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Flexbox Cheatsheet

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Flexbox Cheatsheet

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Flexbox Themes & Templates

Responsive Landing Page Template With Flexbox

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Django Flexbox Theme

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New in Bootstrap 4 Theme

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Bootstrap 4 admin starter theme

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Flexbox Based Libraries

Hagrid

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CCFlexbox

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FlexCss

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FlexboxRb

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flexbox-library

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md-flexbox

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REACT PLAN

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flex-css-lib

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Flexbox References

CSS Flexible Box Layout Module Level

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Learn Box Alignment

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A Complete Guide to Flexbox

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Flexible Box Layout Module

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flexbox

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CSS flex Property

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Solved by Flexbox

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Flexbox adventures

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flex

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Using Flexbox today

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What IS Flexbox

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Awesome Flexbox

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A Visual Guide to CSS3 Flexbox Properties

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What The FlexBox

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Flexbox: The Next Generation of CSS Layout Has Arrived

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Advanced Cross-Browser Flexbox

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Flexbox Codrops CSS Reference

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CSS3 Flexible Box Layout Explained

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CSS3 Flexible Box

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A Quick Responsive Grid System with Flexbox

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Flexbox — Fast Track to Layout Nirvana

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Flexbox: Reference Guide

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Useful Flexbox Technique: Alignment Shifting Wrapping

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Using CSS flexible boxes

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Designing CSS Layouts With Flexbox Is As Easy As Pie

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Responsive Design of the Future with Flexbox

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How To Get Started With CSS Flexbox

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Laying Out A Flexible Future For Web Design With Flexbox

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Getting Dicey With Flexbox

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Don’t use flexbox for overall page layout

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How 3 Modern Tools are Using Flexbox Grids

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Flexbugs

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CSS3 Flexbox Reference

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Flexbox Grid Finesse

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Playing With Flexbox and Quantity Queries

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Flexbox’s Best-Kept Secret

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Star Rating Re-imagined with Flexbox

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CSS Layout with Flexbox

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Flexbox

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Dive into Flexbox

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Flexbox in the Real World

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