In Gres

"Ingres is a proven, high-performance open source relational database solution that offers the scalability, integration and flexibility to leverage information resources across a wide range of platforms, including Linux, UNIX, Windows and OpenVMS. Ingres is a robust RDBMS that has thirty years of industrial-strength experience with commercial use in mission-critical applications. Reliable and cost effective, it supports a variety of applications, from small and medium-sized businesses to high-volume deployments in large-scale enterprises. "

http://en.wikipedia.org/wiki/Ingres

"Ingres (pronounced "ingress") was an early relational database management system, created as a research project at the University of California, Berkeley starting in the early 1970s and ending in the early 1980s. The code, like that from other projects at Berkeley, was available at minimal cost under a version of the BSD license. Since the mid-1980s, Ingres had spawned a number of commercial database applications, including Sybase, Microsoft SQL Server, NonStop* SQL, Informix and a number of others. A follow-on project started in the mid-1980s as Postgres, leading to the development of PostgreSQL, Illustra, and later versions of Informix. By any measure, Ingres was one of the most influential modern computer research projects."

Subject:	RDBMS
Subject:	Abandonware
Subject:	Open Source
Vendor:	CA