Looksy for iMessage - Live video chat stickers
Storyheap - Manage your SnapChat and Instagram stories.
StoryTracker - A library of relevant campaign stories saved for 30 days.
Stori - The best way to analyse your Instagram Stories 📈 🦄
GIPHY Stickers for Instagram Stories - Add fun GIF stickers to any photo or video in your story
Zuck.js - JavaScript library that lets you add Stories everywhere