Free Design Templates from Zeroqode - A free collection of web design templates in PSD & Sketch format.
Bootstrap Zero - Open-source, free Bootstrap templates collection.
CloudApp - CloudApp allows you to share images, links, music, videos and files. Here is how it works: choose a file, drag it to the menubar and let us take care of the rest.
Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
Flutter Widget Livebook - 100+ widget live preview samples, built with flutter for web
Material Design for Bootstrap 4 - Powerful and free UI KIT for the newest Bootstrap 4 and Material Design