Mac OS X Softwares to Interactive map

Calligra Braindump is a free and open-source mind-mapping and brainstorming tool designed to capture, organize, and visually represent ideas and information. It facilitates the process of dumping your thoughts onto a canvas and structuring them into a coherent map, supporting various input types like text, drawings, and images.

Docear is a free academic literature management suite designed to help researchers organize their studies. It uniquely integrates reference management, mind mapping, and PDF handling, providing a unified environment for exploring, analyzing, and writing about academic literature. Its portable nature makes it ideal for use across different machines.

FreeMind is a robust, open-source, and free mind mapping software written in Java. It's a versatile tool for brainstorming, organizing thoughts, managing projects, and structuring knowledge hierarchically, providing a flexible canvas for visual thinking.