Today’s free design resource Material Design UI Kit – Sepia is designed and released as a freebie by Jakub Kośla.
This is a small set of basic pieces consistent with the guidelines of Material Design comes as PSD.It contains screens and some essential pieces like actionbars, buttons,cards, forms, icons, keyboard, switches etc.
The licence is totally open, do with it whatever you want.
A .sketch file would be awesome.