There are a multitude of options out there to build your own website/web app from scratch.<p>Looking at Github these are the top 3 repos by stars:
- Bootstrap (twbs/bootstrap)
- Materialize (Dogfalo/materialize)
- Bulma (jgthms/bulma)<p>What other frameworks are there using flexbox, opinionated or no, offering responsive layouts etc?<p>What did you choose and why did you go for it?
What do you mean by 'CSS framework'? If you mean a grid system then you don't need any of them - just use CSS grid. Follow Jen Simmons' "Layout Land" videos on YouTube to get up to speed fast. On the other hand, if you mean a UI toolkit (lots of useful components) then any of those three would work well. I like Bootstrap but only because I already know it..<p>If you're using React then material-ui.com is another good option.