http://www.akidsphoto.com/ Our photo collection is packed with beautiful flowers, amazing animals, birds, roses, floral, scenic and object photos. All photos, images and graphics are suitable for all ages. We also have games and puzzles for some added fun for everyone! All of the photos and images are royality free… No credits needed, no funds of…
https://romannurik.github.io/AndroidAssetStudio/ Icon generators allow you to quickly and easily generate icons from existing source images, clipart, or text.
http://capptivate.co/ Capptivate.co captures fleeting transitions between app screens and delightful animated UI elements.
http://inspired-ui.com/ A showcase of the best examples of beautifully designed mobile apps – iPhone, iPad, Android, UI Patterns.
https://thenounproject.com/ Creating, Sharing and Celebrating the World’s Visual Language. Free membership available.