Continuing to survey additional product related to the event processing area, I came across Quartet, this illustration is taken from Quartet FS' webpage. Quartet FS advertises its product as "aggregation engine", from the description it seems to be some incarnation of active database, where the OLAP cube is constantly updated, this variation is useful for some financial services applications. I guess that we'll discover more event related products coming from different areas within different frameworks (in this case - OLAP/BI).
