What about bootstrap alternatives??
Foundation or semantic?

Materialize.

Blua

Bulma is pretty damn nice imo

I usually write my own.
Css frameworks rarely save me any time due to the amount of fiddling required to make them do what I want.

@Ashkin do you think you really are able to spot all problems and edge cases the Twitter crew fixed with bootstrap?
Quoting Linus Torvalds : given enough eyes all bugs are shallow.
You have, like what, your own eyes?

@mt3o For my own projects? I absolutely trust my css abilities.

For much larger projects?
I don't trust other devs' css abilities, and therefore want to make maintaining it easier for others. A css framework in these cases can be beneficial.

It's essential to pick the proper tools for the job. And to know why they're the proper tools.

@Ashkin @mt3o PureCSS ( http://www.purecss.io ) is nice if you don't want to go with a fully blown framework - just pick the modules you need. I used to grab the Grid System only and do the rest myself.