Atro is a beautiful mobile UI kit that includes 12 ready-made screens you can start from for building your own app.
Freebies tagged mobiles
Slideout.js is a lightweight and dependency-free plugin for creating touch slide navigation menu for web and mobile apps.
Slideout.js – Touch navigation menu
An interesting pull menu interaction experiment for mobile devices made with few lines of CSS and Javascript.
Pull menu interaction concept
Ionic is a beautiful front-end framework for developing hybrid mobile apps in HTML5. Available on Github.
Ionic – HTML5 mobile app framework
Today ‘s freebieis an excellent PSD UI kit. Crystal is a free Mobile Application UI design from cssauthor.com, you can use this in many ways
Crystal – Mobile UI Design
Free PSD icons of the most popular mobile devices out there (Nokia Lumia 900, Nexus 7, Samsung Galaxy SIII, iPhone, iPad).
Mobile devices icons free PSD
Download the high resolution free PSD mockup and resources of the newest Samsung Galaxy S III.
Samsung Galaxy S III PSD mockup
Another iPhone 5 free PSD mockup! Thanks to Roy Abbink.