MindRaider is a multi-platform, free note-taking program that combines a tree-like hierarchical organization alongside a "free form" structure based on tagging your notes. It supports many notes formats (rich text, HTML, TWiki, plain text, and even sketches). But what is truly unique about this program is a visual component whereby your notes structure is either displayed in a "mind mapping" style relationship diagram, or otherwise within a "tag cloud" representation. It also allows you to embed links within notes to other entities.

You should check this program out whether you are satisfied with your notes program or you’re looking for the next, best thing. (If you are in the latter category then read on; MindRaider may just be the program that you’re looking for).

There are FIVE things that you need to know about this program:
-Tree hierarchy: allows you to organize and retrieve your notes within a tree-style hierarchical structure.
-Notes tagging: in addition to the tree structure you could use a "free-form" structure through the use of tags (i.e. to use tags and hierarchies jointly).
-Notes formats: you can create notes in multiple formats such as rich text, plain text, HTML, Twiki and even graphical sketches (see images to the right).
-Links: allows you to embed links within your notes to other notes/outlines. You could also drag and drop elements into MindRaider (such as files or links in your browser). See this page for more info.
-"Visual" component: this is very interesting. The software automatically generates a diagram of relationships using the tree hierarchy as well as any links that you’ve made within the notes.

http://downloads.sourceforge.net/mindraider/mindraider-7.6-windows.exe