Freeplane

Freeplane is a free and open-source software application that helps you think, share knowledge, and accomplish tasks at work, school, and at home. The software can be used to create mind maps and analyze the data contained in them. Freeplane works on any operating system that has the latest version of Java installed. It can be operated locally or from portable storage, such as a USB drive. 

Features & Highlights

• Note-taking using freely positionable, unconnected nodes (post-its); 
• Organizing thoughts (nodes) into a hierarchy linked by lines (edges); 
• Classifying nodes based on metadata (attributes) and style kinds (system styles, user-defined styles, level styles); 
• Nodes are grouped by visual containers (clouds) and accolades (summary nodes); Connecting nodes using dynamic linkages, free lines (connectors), and labels. 
• Automatically style nodes (with a bubble, color, edge type, etc.) based on hierarchical level and content (conditional styles, automated edge color, level styles); 
• Nodes are structured based on their content (text, scientific formula, calculation, icon, image, and hyperlink) and presentation area (core, details, notes, attributes, photos, and tooltip). 
• Changing views by hiding material (folding branches, filtering, a roll-up of details, and hiding extensions in the tooltip), discovering, scrolling, and navigating: 
• Tasking with the calendar and reminders. 
• Password protection of the entire map and individual nodes using DES encryption; 
• Easy to use with inline and dialog editors, object-oriented main menu, context menus, multi-language support, spell checker, properties panel, drag-and-drop capability, hotkeys, options for batch execution, publishing, sharing, and configurable preferences; 
• Approximate Search (similarity search) finds search terms in a text even when there is no exact match (for example, "setup" equals "set up" or "flie" means "file"). 
• Support for LaTeX formulas underneath/in nodes. 
• Easily extend functionality using add-ons and custom programs; 
• Integration with the Docear academic literature suite. 
• Wiki and Forum provide extensive support, as well as tutorials and documentation in the form of mind maps. 
• Freeplane can run on any operating system that has Java Runtime Environment installed.