Buildster

Features of Buildster:

Upload your building plans, invite people to your project and assign tasks and reminders quickly by dropping pins onto your floor plans.
Accept invitations to join other peoples projects and easily access important project information and communication.
Instant message team members and keep your messages organized in your projects and out of your personal life.
Comment back and forth on open tasks and get notified when items are completed by others.
Easily reassign pins to other team members.
Attach photos to tasks
Quickly create location specific reminders for yourself.