Trello (https://trello.com/) is a free and easy way to make a kanban board. It helps to test board ideas and helps organize stuff.
Kanban limits WIP (Work in Progress) and makes that work visible. It's one of the great ideas and applicable in many domains. My latest kanban board is for stuff I ordered. "Wishiist", "To Order", "Ordered", "Delivered". The "Ordered" column helps to see the amount of open orders.