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.