GUI KIT - Koral is a pack of 15 screens. The whole pack it's oriented on e-commerce and it covers all the screens that you need to build the next awesome shop out there. - by Ionut Zamfir #psd #gui #behance
New iPhone Design Guide
These days designers are really confused about how to design the new iPhone screens. Here is a useful guide for you. You can download attachment for free.
Interactive Motion Design by John Schlemmer: http://www.playmagazine.info/interactive-motion-design-by-john-schlemmer/
Portland UI Kit - Buy Now for $48 - https://creativemarket.com/Craftwork/543100-Portland-UI-Kit