D3E is a tool for document-centric discussion. The document could be anything, from a research paper, to a policy proposal, to a multimedia student assignment. D3E makes it easy to transform an HTML file into an interactive document, tightly integrated with topic-specific or section-specific discussion threads. Check the overview for a description of the different components available. D3E started as an action research project into the social and technical design of scholarly communication technologies (see their papers for details). D3E is, however, a generic web publishing tool that has proven to have wider scope. D3E builds 100% on Open Source technologies, and is distributed as such: download client/server applications and code, and join the user/developer community! This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.