Kanboard - Kanboard is a free and open source Kanban project management software.
Businessmap.io - Businessmap is the most flexible software platform for outcomes-driven enterprise agility.
Excalidraw - Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.
Kinopio - Thinking canvas for mind mapping, brainstorming, and moodboards
Kanban Tool - Simple and effective online application for visual project management.