GmailSniffer is a Gmail Notifier for linux, written in QT4, it checks unread gmail emails, if any, it will show a popup notification, or it can be set to use default system (linux) notification
can set popup window position
can set to use system notifier
can enable/disable sound alert
can assign default browser
can set email check interval
Tested od LMDE, Mint 14, Fedora 17. KDE, MATE, Cinnamon