eXcelon Corporation
- Provider of data management software for applications built using XML, C++ and Java, that maximizes flexibility, speed, scalability and run-time availability.
- http://www.exln.com/

Informate International
- A European software house specialised in object technologies.
- http://www.informate.be/

NiSUS Technologies Inc.
- A software and hardware company that provides development, research, and consulting services.
- http://www.nisustech.com/

Wyde Inc.
- Developers of enterprise object-oriented specification and development tools.
- http://www.wyde.com/

Hitachi Software
- Provides a range of CORBA based products and services for scalable, fault-tolerant applications.
- http://www.hitachisoftware.com/

Cunningham & Cunningham, Inc.
- A small consultancy specialized in object-oriented programming and pattern languages, located in Portland, OR.
- http://c2.com/

Codagen Technologies Inc.
- Develops gen-it, a family of code generators which allows generation-time control and customization for integrating frameworks with components developed using Java, C++, and Smalltalk.
- http://www.codagen.com

Cincom Smalltalk
- An object-oriented application development environment that enables large organizations to quickly develop and maintain complex component-based applications. (Cincom Systems)
- http://www.cincom.com/objectstudio/

Project Technology, Inc.
- Home of the Shlaer-Mellor Method. Also now getting on board with UML.
- http://www.projtech.com/

Persistence Software, Inc.
- Developers of application servers for C++ and Enterprise JavaBeans based on object-relational mapping, object caching and proactive notification.
- http://www.persistence.com