This paper presents a state of the art review of existing research, projects, and the applications in domain of collaborative conceptual design based on the Internet and Web technologies. The purpose of the rewiew is to understand of the needs for conceptual engineering design, to clarify the current conceptual design practice, to classify the available tecnhologies, and to study the future trend in this area. The emphasis of this paper is to briefly outline the methodologies, architectures, and tools developed for the projects reviewed in this paper. It also uncovers approaches to conflict resolution and team/projetc management, as they are vital to a successful engineering design in a collaborative environment. More than 80 journal and conference papers and about 20 projects are reviewed based on the primary focus mentioned above. The selected research works are further categorised into several areas based on application domain, design theory, and the technology used for implementation. The selected research projects and applications are basically for, but not limited to, the collaborative conceptual design.