OpenI plugin for Pentaho CE provides a simple and clean userinterface to visualize data in OLAP cubes. It supports both direct Mondrian and xmla based connections like Microsoft SQL Server Analysis Services (SSAS), plus provides add-on features like Explore Cube Data, custom SQL for drillthrough data, publishing drillthrough data to external web services etc.
A Flex/java based system for presenting statistics over the net. Based on Mondrian backend. Able to handle large amounts of data, administration facilities not worth shouting about.
Standalone Java application to view any hierarchical data structures in a JTree. Keys and names to show in the tree are solely driven by SQL statements. The same applies to the additional node's data, which is shown in a separate table panel aside.
JSMuDIT (JavaScript MultiDimensional Interactive Tables) builds tables with several (hierarchical) dimensions the user can dynamically interact with and customize using drilling, slicing, dicing, expand/collapse, sorting, color-coding, etc.