(Russian article) Raises a valid question: how do we statistically interpret PERT deviation? Can we use it to estimate confidence level? Author thinks it is too much inaccurate, from pure statistics point of view. Proposes alternative approach (based on 2 point estimations, min & max, and Normal distribution.
Spiral lifecycle. Was invented by a particular company in their specific project environment. As far as I know, has no wide applications in other teams.
One more tool. Commercial again :( But this one, they support Kanban board, integrated into the overall system. With bug tracking and effort tracking. They say you can use it for Kanban, Scrum, or whatever your process is.