Appcues for Product Adoption - Make your product easier to use. Code-free.
Mobbin - Latest mobile design patterns & elements library
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
pttrns - iPhone and iPad user interface patterns
UserGuiding - User onboarding made easy, for less. Create product walkthroughs in a couple of clicks, without breaking the bank.
Page Flows - User flow design inspiration for mobile & desktop