The only freeware web-based OLAP solution I've seen is the Data Warehouse Subsystem bundled with Philip Greenspun's ArsDigita Community System (ACS) which runs under AOLserver and Oracle. Although I use the ACS, I haven't run the Data Warehouse Subsytem, I have seen Philip demonstrate some of its capabilities - seemed comparable to the various web-enabled commercial OLAP solution. The Data Warehouse Subsystem is relational OLAP (ROLAP), so all of the multi-dimentional aggregation is done within the database itself. FWIW, I develop Business Objects solutions at my work and am happy with it. http://www.photo.net/doc/dw.html
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AFAIK the ACS system and AOLserver are open source not freeware. Oracle is neither. And yes, it runs under UNIX.
The only freeware web-based OLAP solution I've seen is the Data Warehouse Subsystem bundled with Philip Greenspun's ArsDigita Community System (ACS) which runs under AOLserver and Oracle. Although I use the ACS, I haven't run the Data Warehouse Subsytem, I have seen Philip demonstrate some of its capabilities - seemed comparable to the various web-enabled commercial OLAP solution. The Data Warehouse Subsystem is relational OLAP (ROLAP), so all of the multi-dimentional aggregation is done within the database itself. FWIW, I develop Business Objects solutions at my work and am happy with it. http://www.photo.net/doc/dw.html