yEd is a free general-purpose diagramming program with a multi-document interface. Developed by yWorks
License: Free
Freeplane is an open-source mind mapping tool ideal for personal knowledge management, while yEd Graph Editor excels in graph visualization and supports a wider range of diagram types. Users looking for a free and customizable mind mapping experience may prefer Freeplane, whereas those needing robust graphing capabilities and collaboration features might opt for yEd.