CheckGmail is an alternative Gmail Notifier for Linux and other *nix systems. It is fast, secure and uses minimal bandwidth via the use of Atom feeds.
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Opera is a full-featured Internet tool, most notably a fully standard conforming Web browser. Opera includes pop-up blocking, tabbed browsing, integrated searches, and advanced functions like a password manager, mouse gestures, native Scalable Vector Graphics (SVG) support, an email program, RSS newsfeeds, and IRC chat. It is designed to be fast and highly customizable.