A nice UI kit inspired to Google Material Design. Free PSD designed and released by Jakub Kośla.
Materia is an UI Kit for Android based on Google Material design and released exclusively for Freebiesbug.
A very simple invoices app concept for your inspiration. Free PSD designed and released by Monika Majkowska.
Here is WhatsApp design concept for OSX designed with Sketch app. A freebie designed and released on dribbble by Roman Kornikow.
Here is the Google Inbox user interface created with Sketch app. Freebie released by Erika Ito.
Here is a small photo app UI concept for iOS. Free PSD designed and released by Virgil Pana.
Here is a Skype app concept built with Material Design by Google. Free PSD created and released by IndiaNIC.
A weather app concept based on Sergey Valiukh dribbble shot and built with pure CSS. A snippet created by David Khourshid.
Here is a basic template to showcase the best features of your app, enriched with a video slider for a better user understanding.
A Photoshop template including GUI elements found in the public release of iOS8. Free PSD released by teehan+lax.
Here is a complete GUI pack including some Apple Watch apps concepts. Free PSD designed and released by Jan Losert and Lukáš Kus.
TETHR is an impressive and complete UI kit for iOS design. This resource is free for a limited time only! Released by Invision.
Here is a recipes app design made of 5 screens. Free PSD designed and released by Kristijan Binski.
Redesigned Facebook app using Android Material Design philosophy. Free PSD created and released by Ruban Khalid.