Commentpress is an open source theme and plugin 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.
OxGarage is an experimental web, and RESTful, service to manage the transformation of documents between a variety of formats. The majority of transformations use the Text Encoding Initiative format as a pivot format.