This add-on notifies you of stinger scenes in the current movie. It pops up a notification when the credits roll (or at least towards the end).
Stinger scene notification can be installed from the official Kodi add-on repository, under "Services", for Kodi 16 Jarvis and up.
It uses tags to identify movies that have a stinger scene, which can be automatically added by the Universal Movie Scraper from The Movie Database, as 'aftercreditsstinger' and 'duringcreditsstinger'. If chapters are available, the notification pops up when the last chapter starts, which is generally the credits, otherwise 10 (configurable) minutes before the movie ends.
Support and discussion thread on the Kodi forums.
To add these tags to new movies automatically, use a movie scraper that can set tags from The Movie Database. The Universal Movie Scraper and The Movie Database Python can be configured with a setting.
If your existing movies don't already have these tags, you can avoid rescraping them with a handy once-off option in the add-on settings under "Advanced", "Grab stinger tags from TheMovieDB for all movies", which will run through your library and grab these tags for all movies from The Movie Database. New movies should still be tagged by the scraper as described above.
The tags can also be added with nfo files, if that's your style.
It has a simple skinnable window with 2 built in labels: id="100" for the stinger
type (During credits, After credits) and id="101" for the full message.
The window property stinger is set on the window fullscreenvideo when the
video starts. Possible values for stinger are duringcreditsstinger, aftercreditsstinger,
duringcreditsstinger aftercreditsstinger if the movie has both, and None. The
property is only set when a movie in the library is playing, and empty in all other
cases.
Movies don't always start the last chapter when the credits begin rolling, so the notification won't be timed right for a handful of movies.