Wikipedia
Illustra was a commercialized version of the Postgres object-relational database management system ( DBMS) sold by Illustra Information Technologies, a company formed by Michael Stonebraker and Gary Morgenthaler and several of Michael Stonebraker's current and former students including: Wei Hong, Jeff Meredith, Michael Olson, Paula Hawthorn, Jeff Anton, Cimarron Taylor and Michael Ubell. The technology's extensibility model centered on DataBlade modules that defined types and associated index methods, operators, and functions for purposes and data domains that included Web publishing, search and manipulation of text, and management of geospatial information.
The company was sold to Informix in 1997. The technology was folded into the Informix 7 OnLine product line, leading eventually to the creation of the unified Informix Universal Server (IUS) product line. The entire Informix product line was sold to IBM, which makes it available free of charge.