There are some popular cross platform apps like Truecrypt and Dragondisk without indicator support.
Vino also needs whitelisting because otherwise you won't recognise established remote desktop connections.
Gnome Phone Manager, Artha, Cryptkeeper - just to mention some other Linux apps which rely on a tray symbol and have no indicator support, too.
There are some popular cross platform apps like Truecrypt and Dragondisk without indicator support.
Vino also needs whitelisting because otherwise you won't recognise established remote desktop connections.
Gnome Phone Manager, Artha, Cryptkeeper - just to mention some other Linux apps which rely on a tray symbol and have no indicator support, too.