Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Iconosquare - Schedule now. We'll post on Instagram for you later!
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Later - Schedule and manage your Instagram posts
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Storyheap - Manage your SnapChat and Instagram stories.