Compendium is a computer program and social science tool that facilitates the mapping and management of ideas and arguments. The software provides a visual environment that allows people to structure and record collaboration as they discuss and work through wicked problems.
See 'Compendium (software)' wikipedia 
Compendium Institute archive
CompendiumNG is continuation of the original Compendium project. It is based on version 2.0.1-beta of Compendium project. github
Common usages of Compendium include: Dialog Mapping and Mind Mapping.
See also TheBrain