Microsoft Planner provides a simple, visual way to organize teamwork. You can create new plans, organize and assign tasks. Share files, chat about what you're working on, and get updates on progress. Planner integrates with Microsoft's Office suite and related services. The app is free for iOS and Android, but requires an Office365 subscription.
Trello is another popular option, especially for those preferring to use lots of visuals when planning. Instead of written lists, Trello uses "boards" and "cards" to keep track of tasks involved in any giveN project. That makes it easy to track your progress. Free for iOS and Android, though it has a five-dollar monthly subscription.
Asana allows users to quickly capture tasks, to-dos and reminders. It won't let you forget ideas. Get updates from coworkers, organize tasks and projects for work, or manage your to-do list for the day. With Asana's mobile app integrated with a web version, you can stay on top of your work from anywhere. The app is available for iOS and Android.