Arora is a simple cross-platform Web browser whose feature list includes things like "History" and "Bookmarks". It has a small code base. It was originally created as a demo for Qt to help test the QtWebKit component and find API issues and bugs before the release. A very old version can still be found in Qt's source code in the demo/browser directory. Arora works on Linux, OS X, Windows, FreeBSD, and embedded Linux using Qt Embedded, and works anywhere else Qt does.
AstBill is Web-based billing, routing, and management software for Asterisk and MySQL based on Drupal. It provides pre- and post-paid billing services. It completely automates Asterisk billing from start to finish. Key benefits are the central Web-based installation, credit control on outgoing calls, and the call routing module.
LinkBrowser is a program for browsing the links in HTML documents and downloading the files that they reference. Basically, this program is like a normal Web browser, but instead of rendering the HTML it just shows a table of all the files that the html references. The files can be downloaded in batches.
GtkMathView is a GTK widget for rendering MathML documents. It is meant to be a standalone, light-weight component and not a full browser. GTK applications can use the widget as a window for displaying mathematical formulas and doing simple interactions. Among other features, GtkMathView includes support for breaking long mathematical expressions, rendering of stretchy operators, and provides a customizable support for additional fonts.