OpenBoard - The OpenBoard software is an interactive white board software.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Conceptboard - Instant Whiteboards for Teams & Projects
Nifty - Manage projects, work, and communications in one place.
IDroo - A shared whiteboard for use by multiple Skype-users simultaneously. Features
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.