An free Adobe Xd UI based on the popular framework Bootstrap 4 for prototyping or establising front-end style guides.

4ocal contains more than 260 elaborate ui templates in 22 categories and 10 pre-build landing pages

DashExpert in Professional, clean and modern design dashboard template. Its fully free for personal or commercial use. All the layer are well organised. So its very easy to use.

Onshore App Design is a surf app concept by Dann Petty to show off the insane new features of Adobe Xd.

Amazon Alexa UI kit that includes components and templates for four of the Amazon Echo screens: Echo Spot, Echo Show 1st gen, Echo Show 2nd gen, and Fire TV,

Carefully crafted and easy to use landing page builder. 160+ screens and 700+ elements.