Might be useful for people doing missions or even a singleplayer campaign (though it's not really recommended for the latter at present).
Github
Currently supports most of the basics: adding text, images and background, playing sounds and music, move and fade in/out animations.
Full list of actions documented here
Controls: Click somewhere in screen (anywhere overlapping the background image) to advance. Right-click hides/shows GUI. Hold down Ctrl to fast forward.
Current limitations:
- Image → image transitions are basically unsupported and have to be done manually. Fancy transition types (blur, dissolve, etc) don't exist at all.
- Save/load in its current state is only really useful for debugging. Only one save is allowed per "story", there's no dialog for choosing save directory/path, etc.
- There's no indicator for auto-advance mode.
- No custom screens or i18n support (yet).