http://www.mozilla.org The home port for all things Mozilla, including Firefox, Thunderbird, the Mozilla Suite. Get extensions and themes here.
http://www.spreadfirefox.com The community marketing effort for Firefox. Get a link for your own web page, and some ammunition for the war with Internet Explorer.
http://www.mozilla.org/projects/seamonkey The next generation of the Mozilla Suite.
http://konqueror.kde.org Learn more about both sides of Konqueror.
http://www.gnome.org/projects/epiphany Get your Epiphany extensions, and learn more about its features.
http://galeon.sourceforge.net/Main The Galeon page.
http://www.opera.com Home of the Opera browser. Download the latest version, sign up for OperaMail, and do your own blog, too.
http://www.gnome.org/projects/evolution The Evolution home page.
http://www.mozilla.org/products/thunderbird The Mozilla Thunderbird page. Links to MozillaZine knowledge base and help forums.
http://pim.kde.org Home of the KDE Personal Information Management suite: Kontact, KMail, Korganizer, and the ancillary tools.
http://sylpheed.good-day.net Sylpheed, the other GTK-based mail client.
http://www.mutt.org The mongrel of text-based email clients.
http://www.fpx.de/fp/Software/UUDeview The UUDeview multiformat file attachment decoder. Works with all encoding formats (BinHex, yEnc, MIME, UUEncode). Enjoy the Introduction to Encoding document and get some useful history, too.
http://www.yenc.org/linux.htm Linux readers and writers for the yEnc coding format.
http://email.about.com/cs/standards/a/base64_encoding.htm An excellent description of Base64 encoding.