Previagram - Preview your ideal photo grid and create mosaics for free
Smarter Top Nine Tool - Instagram Top Nine re-invented - pick your best & rearrange!
Likecreeper - Randomly hit like on a friend's horrifyingly old Instagram
LikelyAI - Predict the popularity of your Instagram photos.
Layout by Instagram - Combine multiple photos into a single image
Top Nine for Instagram 2019 - Find and share your Top Nine Instagram photos from 2019