A brilliant task manager app, Producteev is perfect for your mobile device (iOS or Android), although they still have to place updated versions in app stores. You are issued with a network on which you gather collaborators and tasks onto a single screen. Manage privacy levels, prioritise and track your project, and add subtasks and deadlines. Receive notifications, turn emails into tasks and attach files. In fact, this little app will do everything a much larger desktop version will do. And if you don’t need help and don’t mind their logo, its free, too.