Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Mobbin - Latest mobile design patterns & elements library
Visage - Visage is a new platform that enables non-designers to easily create beautiful, on-brand visual content such as data visualization, reports & much more
pttrns - iPhone and iPad user interface patterns
Start on Android by Google - Developer program to optimize your app before you launch
UX Archive Animated - iOS apps animated user flows