Previagram - Preview your ideal photo grid and create mosaics for free
myPrimeNine - Share your most popular photos from all your social networks
LikelyAI - Predict the popularity of your Instagram photos.
Flip - A seamless way to capture looping videos on mobile 🎬
Top Nine for Instagram 2019 - Find and share your Top Nine Instagram photos from 2019
Layout by Instagram - Combine multiple photos into a single image