gleeBox takes a keyboard-centric approach to navigating the web and provides alternatives to actions that are traditionally performed via the mouse. It is mostly meant for keyboard and command line lovers.
Screencasts and more at http://thegleebox.com.
gleeBox is available as a Chrome, Safari and Firefox extension.
Firefox (outdated): https://addons.mozilla.org/en-US/firefox/addon/59191
Development (if you like living on the edge)
Chrome/glee_chromeas unpacked extension (in Developer mode).
Safari/gleeBox.safariextensionas a new extension in the Extension Builder.
Want to help out? Bravo! Before you start, check out these wikis: