I’ve used WBS Chart Pro and PERT Chart EXPERT from Critical Tools.
WBS Chart Pro works great for projecting the WBS on a screen in block diagram format while working with team members to build it. Then Chart Pro links directly to MS Project to build the schedule activities. I’ve used it with 2010.
Both are good for making large plots. I’ve used PERT Chart Expert on big schedules to make network wall charts to “Wall Walk” the activity network with teams to validate logic.
Interested to hear anyone else’s experience on these and the other tools mentioned.