CommentPress is an open source theme for the WordPress blogging engine that allows readers to comment paragraph by paragraph in the margins of a text. Annotate, gloss, workshop, debate: with CommentPress you can do all of these things on a finer-grained level, turning a document into a conversation. It can be applied to a fixed document (paper/essay/book etc.) or to a running blog.
Sophie is software for writing and reading rich media documents in a networked environment. Sophie’s goal is to open up the world of multimedia authoring to a wide range of people and institutions and in so doing to redefine the notion of a book or
WebCite® is an archiving system for webreferences (cited webpages and websites), which can be used by authors, editors, and publishers of scholarly papers and books, to ensure that cited webmaterial will remain available to readers in the future. Authors
A site where you can have a secure, optionally private, ad-free wiki of your very own for a few dollars a month, or an insecure, ad-infested, public wiki for free. Neat-O.