I used to use Bootstrap quite a bit. At work, I use Foundation, but have outgrown it and will be rolling our own soon.
For my own projects, I will start from scratch except for the grid. I created my own grid framework because I couldn't find one that met my preferred naming scheme and had all features that I needed/wanted: https://github.com/alexchantastic/lattice.css.
I used to use Bootstrap quite a bit. At work, I use Foundation, but have outgrown it and will be rolling our own soon.
For my own projects, I will start from scratch except for the grid. I created my own grid framework because I couldn't find one that met my preferred naming scheme and had all features that I needed/wanted: https://github.com/alexchantastic/lattice.css.