OnAGUI (Ontology Alignment Graphical User Interface) is a project of alignment helper and viewer. You can edit ontology (SKOS, OWL) and edit alignment between concept of these ontologies. In addition, you can make automatic discovery of alignment, using different kind of algorithm.
This work was initiated by Jean Charlet (http://estime.spim.jussieu.fr/~jc/), designed and developped by Laurent Mazuel on a post-doctoral project. By now, this project becomes Open Source, and continues to be enhanced by J.Charlet and L.Mazuel.