IHMC Concept Map Tools
The Institute for Human and Machine Cognition makes available the Cmap Tools program for constructing, navigating, sharing and criticizing knowledge models represented as concept maps. The free desktop application is available for Windows, Macs, and Linux computers.
Related entries:
Coggle in the Classroom: Clean, Easy Concept Mapping
Using Visual Understanding Environment (VUE) as a Concept Mapping Tool
Mindmeister Concept Mapping Tool