Android Interface Guidelines
Guidelines on the creation of Google Android applications
iOS Interface Guidelines
Guidelines on the creation of Apple iOS applications
Lean UX
An introduction to the Lean UX cycle
Logobook
A collection of famous logo's, with the option to search by categories
Marvel
A tool to simulate smartphone application usage and behaviour
Material Design
A guide on the usage of Material Design
Pttrns
A database of mobile design patterns
Xtensio
Various tools and templates to assist in the creation of interactives