Kinopio - Thinking canvas for mind mapping, brainstorming, and moodboards
Sparkin - Idea management platform with creativity tools
Kanboard - Kanboard is a free and open source Kanban project management software.
ScatterNote - A note-taking app for networked thought
Excalidraw - Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
Kindling - Kindling Software was developed by Spigit for the purpose of idea management and innovation in any organization or commercial entity.