SeaMonkey web browser is free open-source suite that integrates Internet browser, e-mail and newsgroup client, IRC chat, and web development tools in a robust, easy-to-use package with other 3rd party addons.
E-Mail, Chat, and HTML
The SeaMonkey Messenger e-mail and newsgroups program looks like its Mozilla and Netscape Messenger predecessors, but adds modern features such as a phishing-detection tool and the ability to view and access mail from several different accounts in a single inbox. To access Internet Relay Chat in either Messenger or Navigator, opens ChatZilla, an open-source IRC instant-messaging program. As for the SeaMonkey Composer HTML editor, think of it as a light version of Microsoft FrontPage. It looks much like a word processor with big buttons for such operations as Publish, Link, Table, and Image, and it lets you work with a page's HTML code.