Open ModelSphere has SILVERRUN PerfectO asfor itsan ancestor, a proprietary software developed by Computer Systems Advisers and released in 1996. PerfectO was part of the SILVERRUN suite of modeling tools, which is known byin the modeling community since the 1990s;<ref>The Decline And Fall of the American Programmer, Edward Yourdon, Yourdon Press, 1993, ISBN 0-13-191958-X, p 154</ref> PerfectO was used to support object-oriented modeling (limited to class modeling at that time) and object-relational modeling.<ref>Informix Unleashed, Sams Publishing, 1997, Chapter 45 (Modeling Types in Informix-Universal Server, Jim Pradesh), ISBN 0-672-30650-6, pp 1117-1118</ref>
In 1998, PerfectO was translated into Java toresulting givein SILVERRUN-JD (Java Designer). With the addition of relational data modeling, the product was renamed to SILVERRUN ModelSphere and released in 2002. Later on, more features were added including support for business process modeling, conceptual data modeling, and UML diagramming.
In September 2008, Grandite released ModelSphere's core application as an open source product based on the GNU Public License version 3. Its development environment is hosted on [[JavaForge]].
