What are some alternatives?
When comparing Terrastruct and UX Archive Animated, you can also consider the following products
SnapUp - Wireframe faster / create amazing user interfaces
Page Flows - User flow design inspiration for mobile & desktop
Plectica - Easily diagram anything, together
UI Patterns - Level up with interactive mobile design patterns
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Really Good UX - A library of screenshots for UX inspiration