Browsers

Firefox

An excellent browser. Used frequently and works well.

Seamonkey

Formerly the Netscape suite, this includes a browser as well as a WYSIWYG (What You See Is What You Get) HTML editor that allows you to publish straight to a Web server.

IceWeasel

A fork of FireFox meant to be entirely open-source. (nyt)

Items marked with (nyt) indicate I have not yet tested it. I've heard
it's good (so it has made it on the list) but have not yet tested it
myself.