Kanboard - Kanboard is a free and open source Kanban project management software.
Note.ly - Note.ly is an easy-to-use platform that allows you to save thoughts and ideas in notes and share them with anyone.
Excalidraw - Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
Sticky Notes - Sticky Notes is an integrated feature of adding notes in the Windows operating systems.
Kinopio - Thinking canvas for mind mapping, brainstorming, and moodboards
Hott Notes - Hott Notes is a free reminder for Windows operating systems.