This free software is developed in Java and is specially prepared for this purpose. The maps that you have created can be exported in PNG, JPEG, PDF, SVG, MM, HTML, XHTML and XSLT format. Developed from FreeMind, Freeplane is ideal for the management of projects, when you require brain storming sessions with multiple collaborators.
You will be able to write down all kinds of notes about the different nodes that you create. Establish the association between concepts and indicate them to be able to have a quicker perspective of your project. It's possible to assign keyboard shortcuts to add indications and make it easier to speed up the map creation process. Import images if necessary to clarify the interpretation of the maps.
Creating mind maps is free with Freeplane, and it's very simple. Download Freeplane for free, it's a good alternative when you have to design your own concept maps.