A Database System for Metamodeling and Method Engineering
...ConceptBase.cc is developed by the ConceptBase Team at University of Skövde (HIS). ConceptBase.cc supports Linux, Mac OS X and Windows. ConceptBase.cc is free software distributed under a FreeBSD-style license.
VisualPerspective is a modeling and diagram creation tool. It enables to create free diagrams but also semantic oriented ones (for instance UML diagrams), in order to run automatic processing (transformations, exports, parsing).
There is currently no installer, so you should follow this procedure :
http://enzweiler.info/visualperspective/002-installation.html
You are very welcome to report any issue with VP.