PBOS

PBOS is a web-based book-annotation system that lets authors add books to read, and readers markup the books with notes, links, bookmarks, and other annotations.

It lets readers share their annotations or keep them private. Written in php w/some perl.

PBOS (Processed Book Operating System, or Processed Book Open Source) is an implementation of some of the ideas in the original essay "The Processed Book".

PBOS provides a very rich context for adding value to a Web-based book through multi-user comments, various kinds of connections, and analytical and visualization tools. The results can range from a few, formal review notes for an author, to a crayonesque markup by mobs of postmodern deconstructors, with the visibility of each controlled by the viewer.

This implementation (i.e., PBOS) is focused on providing very general and extensible facilities for medium to large-scale documents, which are useful for all of the applications mentioned or hinted at in the original paper.

The aim of this section is to provide a comprehensive overview of the implementation's concepts and facilities, both for beginning users and as a basis for informed discussions.

From a practical point of view, the aim of PBOS itself is to be a complete and extensible environment for the creation, maintenance, review, and distribution of Processed Books. Hence the acronymic conceit of "Operating System." 

While PBOS should operate on any standards-compliant Web browser, it makes extensive use of JavaScript and currently has been tested for reliability only on machines running Microsoft Windows Internet Explorer 6.0 and Firefox 1.x, and OSX Macintosh Safari 2.0.1.