K-Meleon
K-Meleon is a fast and customizable lightweight web browser for Windows, based on the rendering engine of Mozilla. K-Meleon is free (open source) software released under the GNU General Public License.
https://kmeleon.sourceforge.net/
NVU
Computers, Open Source, Organizations, Mozilla Foundation - Nvu. WYSIWYG HTML editor with site manangement features derived from Mozilla Composer.
https://nvu.com/
Uzilla: Technology for Web Usability
A new way to conduct usability tests of websites and web applications. Uzilla.net is based on two components, a customized web browser that logs user activity and a internet based data collection and aggregation server.
http://www.uzilla.net/