StelsEngine is a fast in-memory SQL engine (in-memory JDBC) - Multi-OS Shareware $139. StelsEngine is a fast in-memory SQL engine (in-memory JDBC) for storing and processing tabular data in Java applications. Using StelsEngine, you can make processing data in your software considerably easier and quicker.

StelsEngine is as easy to use as possible, since it implements the JDBC API standard. Features: it is JDBC Type 4 driver, supports most keywords of ANSI SQL 92, supports integer, floating point, string, date/time and java object data types, supports aggregate, numeric, string, conversion and user-defined SQL functions, supports data loading from a DBMS, platform independent.