Flowkit - Sketch library for user flows/content maps/annotations
Storyheap - Manage your SnapChat and Instagram stories.
Visual Flows - Simple design process can be here.
Unfold - Create beautiful and engaging stories with minimal and elegant templates. As well as a landingpage for all your links
Flow - Stop managing projects from your inbox.
Stori - The best way to analyse your Instagram Stories ๐ ๐ฆ