Multivalent Browser is a utility that natively views scanned paper, PDF, HTML, UNIX manual pages, and TeX DVI. The browser supports in situ annotations such as hyperlinks, highlights, notes, and executable copy editor markup on any of these formats. It boasts advanced features such as lenses and robust locations. For developers, Multivalent has an API for extensions, and the document viewers can be embedded in Java Swing-based applications.
The Multivalent PDF Tools is a suite of tools for manipulating PDF documents. It includes tools for compressing, uncompressing (for hand editing), obtaining metadata, splitting and merging, encrypting and decrypting, validating, imposition (aka n-up), making page images, extracting text, and full-text indexing (with Lucene). The compress tool shrinks the PDF 1.5 Reference from 13.5MB to 8MB in PDF 1.5/Acrobat 6 format and down to 5.1MB in a new proposed "Compact" format.