The ACCORD project is about development of methodologies, theories, mechanisms, and technologies which will allow for a meaningful interaction among information sources (databases, information systems, web sites, file systems, …) within World Wide Web.
The site has a great collection of resources about ontology matching, alignment, integration, etc.
Chimaera Home Page
Chimaera is a software system that supports users in creating and maintaining distributed ontologies on the web. Two major functions it supports are merging multiple ontologies together and diagnosing individual or multiple ontologies. It supports users in such tasks as loading knowledge bases in differing formats, reorganizing taxonomies, resolving name conflicts, browsing ontologies, editing terms, etc.
Aman\'s Blog 