<p>Visual Understanding Environment (VUE) is a free, open source application for mapping concepts, ideas and digital content. It enables users to generate nodes and links, and apply a simple set of tools to explore the relationships. VUE is, in the words of its developers, an application to "integrate, organize and contextualize electronic content" in research or learning environments. Its tools include visualization, dynamic content mapping, semantic mapping, enhanced pathways and search functions.</p>