OLAP aggregation engine with MDX support, web interface (slice & dice) and relational database backend. See "Documentation" for more. Presentation: http://cubulus.sourceforge.net/. See online demo courtesy of Webfaction, http://alxtoth.webfactional.com
ConDEnSE (Confidential Data Enabled Statistical Exploration) will be a web-based environment for statistical analysis of confidential data from various database sources, based on Plone and R, and using the Jackknife method of confidentiality protection.
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.