giovannicandido uses UIkIt
Provides common user interface like dialogs, menus, etc. Is modular and hight customisable. A part from the grid system, is not used directly, but has as layer of abstraction build with web components, and typescript as far as possible with the time and working constraints, to be reused in other projects.
AskNicely uses UIkIt
UI Kit provides so many great features out of the box. It provides all the tools to build a rich interface with very little configuration. Many of the modules are well documented and are relevant to the common trends we are seeing on websites today.