Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

Kahuna - Best way to understand and engage your mobile audience

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Swrve - An integrated mobile marketing automation platform: analytics, push notifications, A/B testing and in-app campaign delivery.

EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

mobilecommons - MobileCommons makes it easy for companies and non-profits to connect with people on their mobile devices.