Help I need a simple Kanban board!

Every now and again you're on a new project and need to setup a new Kanban board. What should you use? Trello? Jira? Something self hosted? Something freemium or even open source?

Here's a simple solution, use a text file.

$ touch TODO.md

### TODO

- look into X
- do some stuff

### DOING

- the one thing that will make everything else easier

### DONE

- pick a kanban board

Do you need to share it with other devs?

$ git commit -am "add a kanban board" TODO.md && git push

The day you find that you've outgrown this text file, pick a more advanced tool.