Wekan

Wekan, formerly LibreBoard, is an open-source and collaborative Trello -like kanban board application.

Whether you’re maintaining a personal todo list, planning your holidays with some friends, or working in a team on your next revolutionary idea, Kanban boards are an unbeatable tool to keep your things organized. They give you a visual overview of the current state of your project, and make you productive by allowing you to focus on the few items that matter the most.

Wekan supports most features you would expect of it including a real-time user interface, cards comments, member assignations, customizable labels, filtered views, and more.