The Visual Understanding Environment or VUE is a free, open source concept mapping application written in Java.
The VUE project is focused on creating flexible tools for managing and integrating digital resources in support of teaching, learning and research. VUE provides a flexible visual environment for structuring, presenting, and sharing digital information. Using VUE's concept mapping interface, faculty and students design semantic networks of digital resources drawn from digital libraries, local and remote file systems.
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The project seems no longer developed. Last version, 3.3.0, released in October 2015, can be still downloaded from the official website and from GitHub.