Flare by GoDaddy - Discover, give feedback and support startup ideas
Bootstrap Zero - Open-source, free Bootstrap templates collection.
Wittycircle - Networking tool for entrepreneurs, makers and curious minds.
Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
Little Inventors - Turn children's ideas into reality
Material Design for Bootstrap 4 - Powerful and free UI KIT for the newest Bootstrap 4 and Material Design