Sydneydash is one of the most simple and usable for your product with a nice and modern style. It is designed in Sketch App 51.1 with all the elements and layout you potentially need.
If you have an e-commerce website or any other products you need to have customer/client or user private panel, you just found one of the best here.
Some Pages: Dashboard, Mailbox, Calendar, For, Form layout, Basket, Checkout, Payment, Social Profile, Login, …
It is available for Sketch, Figma and Invision Studio.