Google Design Sprint Starter Kit - This Kit helps you to run your first Google Design Sprint.
Dashboard UI Kit - A modern & responsive dashboard UI kit for designers.
Nawvel - Nawvel is a handy-dandy library of tried, tested & curated resources.
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
The Starter Kit - Curated resources for web developers and visual designers
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform