Mostly paper kanban boards. From time to time I tear down the old one and make a new one. I broke mine down into two sheets in order of long-term vs short-term speculativeness then wrote some overflow ideas onto a third sheet.

Paper is my ‘killer app’ when I am having any difficulty with a project. The last thing I need is another window on my virtual desktops to navigate to, if I want to knock down tasks like a beast I print them down and cross them out.