Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Iconosquare - Schedule now. We'll post on Instagram for you later!
Instagantt - Instagantt is a powerful and intuitive Gantt chart tool to enable teams to plan, manage and visualize their projects easily. Manage your schedules, tasks, timelines, and workload like a Pro. Try it for free.
Later - Schedule and manage your Instagram posts
Manifold - Manifold GIS is a combination of mapping, CAD, DBMS and image processing.
Storyheap - Manage your SnapChat and Instagram stories.