UX Archive Animated - iOS apps animated user flows
Mailivery - Reach the Inbox, not the spam folder.
Page Flows - User flow design inspiration for mobile & desktop
Sidemail - The simplest way to send transactional emails. Sidemail makes sending transactional emails trivial, it's perfect for side projects, MVPs or the next big thing.
UI Patterns - Level up with interactive mobile design patterns
Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid