Postedo - Simple Instagram scheduler that publishes for you
Instagress - Instagress is automation software for Instagram.
Later - Schedule and manage your Instagram posts
Instagram Analytics by Socialinsider - Get better at Instagram marketing by studying competition
Grum - Post on Instagram from your computer!
Buffer - Buffer makes it super easy to share any page you're reading. Keep your Buffer topped up and we automagically share them for you through the day.