Listing some of the sites that you can use for inspirations as well as resources to kickstart your designs. I am sure there are a lot more out there, but these are the ones that I frequent to. Will keep updating this list, as and when I came across great services.
Pttrns – Curation of the good looking iOS apps
Capptivate.co – Great interactions that apps are using
Android Niceties – Curation of some of the best Android apps
Tab Patterns – Tablets shouldn’t be left out. Right?
One Page Love – Collection of great single page designs
Awwwards – Design, creativity and innovation on the web
The Best Designs – Good web inspirations
FWA – Recognition for some of the great sites out there
If you have downloaded the latest version of Sketch, the iOS7 template is packed into it.
Creative Market – High quality paid elements and freebies
Graphic Burger – Collection of UI Kits, mockups, text effects
PSDDD – Everything from UI elements to mockups to modals
Mockuuups – High quality iPhone templates
Let me know if you have come across other great services. Will add it up here.
P.S. If you have a mobile app idea and want to create quick prototypes, give Demonstrate a try. It’s easy to use, has some great transitions and gestures to make your prototype look like a real native app. All this without writing a single line of code.