NotifySharp
From NDesk
notify-sharp is a C# client implementation for Desktop Notifications, i.e. notification-daemon. It is inspired by the libnotify API.
Desktop Notifications provide a standard way of doing passive pop-up notifications on the Linux desktop. These are designed to notify the user of something without interrupting their work with a dialog box that they must close. Passive popups can automatically disappear after a short period of time.
[edit] Status
Finished implementing version 0.9 of the specification. notify-sharp will be released once DBusSharp is released.
There are currently some differences between the specification and notification-daemon that need to be fixed but as notify-sharp follows notification-daemon's behaviour instead of the specification's there should be no problems in the future.
In the future, properties for new, standardized hints will be added.