SimpleMind is a cross platform Mind Mapping tool.
License: Freemium
Apps available for Mac OS X Windows Android iPhone Android Tablet
TreeSheets is a free form data organizer. Developed by Wouter van Oortmerssen
License: Open Source
Apps available for Mac OS X Windows Linux
TreeSheets offers a unique grid-based approach to data organization, making it suitable for complex data structures, while SimpleMind focuses on intuitive mind mapping, making it easier for users to visualize and organize ideas.