Ideamerit Designer is a diagramming tool for drawing idea maps, mind maps and creating objectives and key results diagrams as well as decision trees.
The software allows you to quickly specify properties of objectives and key results and visualize the value, status or progress of activities or initiatives.
In the freeware version, you can create ideamaps and mindmaps without limiting the number of elements. Other types of diagrams can be created for less than 10 items in the freeware version.