Apps similar to Flexbox Grid include Bootstrap, which is free and open source. Other options are Tailwind CSS, Bulma, Semantic UI and Foundation. There's no shortage of CSS Frameworks like Flexbox Grid, with more than 25 alternatives for self-hosting, the web, Mac, Windows and Linux.
Create beautiful, responsive & accessible web apps quickly with Vue or Nuxt. Nuxt UI is an open-source UI library of 100+ customizable components built with Tailwind CSS and Reka UI.
Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools.
Eva Design System is a free and open-source, customizable design system. Available for Sketch with Mobile and Web component libraries.
United States
Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
This project's goal is to be able to create a fully accessible material design styled website using React Components and Sass.
Denmark
EU
Simple. Robust. Responsive. Flexible.
Based on Flexbox (CSS Flexible Box Layout Module), Gridlex is a very simple css grid system to quickly create modern layouts and submodules.
FranceEU
Little Widgets is a collection of beautifully designed HTML website widgets and popups. It’s coded, responsive, animated and ready to use on your website.
United States
The 960 Grid System is an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem.
Juiced has many of the same layout features that you know and love, but improves upon them with better mobile targeting, custom column ordering, better alignment options, understandable HTML, and less boilerplate styles.
Spain
