Requires iOS 8.
Extend iOS 8's quick reply system to third party apps. Currently supports Kik, Facebook Messenger, and LINE.
Add widgets to the Notification Centre to quickly send a message from anywhere. Supports the Messages app, Kik, and LINE.
An experimental WhatsApp package that also adds both of these features is available separately (for free).
Add the ability to tap on a banner to quickly reply, without having to choose the action first.
To add widgets: after installing IMN from Cydia, open the appropriate app and you will be prompted to reload SpringBoard. After that, the widget will appear in the edit section of the Notification Centre's Today View.
Configure options from the Settings app.
See larger Screenshots below..