One such app is called Outpost. It allows you to view your projects, messages, to-do’s, and milestones. Outpost will even cache a local copy of your data on your phone so you can access information and post messages/milestones/to-do’s while you’re offline. It then syncs everything once you’re back online. I’ve been using it for awhile now and really love it.

A few other apps you can checkout (note – I haven’t used these, post a comment if you like any of them): Encamp, Groundwork, Projects, Minivan, & Mother Camp.