Kahuna - Best way to understand and engage your mobile audience

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.

Inspired Mobile - Inspired is a unique mobile marketing platform offering an evolving suite of solutions to run all marketing campaigns.

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

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

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.