xxxterm is a minimalist web browser with sophisticated security features designed-in, rather than through an add-on after-the-fact. In particular, it provides both persistent and per-session controls for scripts and cookies, making it easy to thwart tracking and scripting attacks.

In additional to providing a familiar mouse-based interface like other web browsers, it offers a set of vi-like keyboard commands for users who prefer to keep their hands on their keyboard.

Classilla is bringing back web browser support to your classic Macintosh -- built on WaMCom, a port of Mozilla to classic Macintosh systems, using the same technology underpinning the popular Firefox browser. It's completely free and it's open source, and it's standards-compliant. Use it without cost or restriction; or, if you've got the skills, hack it and make it your own. Classilla brings your wonderful old Power Macintoshes back to life and back online.

Bringing gopherspace back to modern operating systems, browsers and mobile devices
Return to the Gopher protocol's low bandwidth and high efficiency, right from your mobile phone or modern computer! Quickly connect to downloads, services and servers maintained across the global Gopherspace using the Overbite Project's free open source gopher client software.

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite (see below). Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates to this concept. Containing an Internet browser, email & newsgroup client with an included web feed reader, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users.

MathJax is an open source JavaScript display engine for mathematics that works in all modern browsers.

Flickriver - view images as a 'river of photos' and more...

There are no external image files or anything, everything is rendered with Javascript using either canvas elements or old fashioned div-making tactics (for IE).