PGChart
From Riley Consulting Wiki
Pert and Gantt Chart
The software development team at The RedX do not use Pert or Gantt charts. Instead they use a system called PivotalTracker to keep track of what needs to be done, who is assigned, and what the estimated for completion are. There are a few downfalls with this, primarily that the critical path is not visible from the app. Other details are contained in my Task Estimation and Accounting proposal.
A screen shot of the Storm pivotal tracker file: