Shards
Shards is a free and modern UI toolkit for web makers based on the popular Bootstrap 4 framework. It’s lightweight, responsive and well documented.
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Now UI Kit
Start a new project or give an old Bootstrap project a new look! Now UI Kit is a free Bootstrap 4 UI Kit, available in HTML or Sketch/PSD format.
Inside Design Resources
Inside Design by InVision offers free design resources including high-quality UI kits, icon packs, mockups and more.