Scrnshts is a great tool that provides a variety of App Store Screenshots, to inspire designers to market their next project!
One Page Love offers unique one page websites (not templates) for your inspiration and references.
Dribbble is the leading destination to find & showcase creative work and home to the world’s best design professionals.
iOS Icon Gallery is a collection of hundreds of iOS App icon designs. It’s a great tool for inspiration on your next App design project.