Mondrian is an OLAP (online analytical processing) engine written in Java. It reads from JDBC data sources, aggregates data in a memory cache, and implements the MDX language and the olap4j and XML/A APIs.
Tockit tries to build a framework for Conceptual Knowledge Processing (CKP) and Formal Concept Analysis (FCA) in Java, using a component-based approach, XML formats and a three-tier architecture.