Knowledge modeling involves the management of many knowledge sources often geographically distributed. The World Wide Web is a distributed hypermedia system available internationally through the Internet. It provides general-purpose client-server technology which supports interaction through documents with embedded graphic user interfaces. This article reports on the development of knowledge modeling tools operating through the web to support knowledge acquisition, representation and inference through semantic networks and repertory grids. It illustrates how web technology provides a new knowledge medium in which artificial intelligence methodologies and systems can be integrated with hypermedia systems to support the knowledge processes of professional communities world wide.