Demo Maker also automates the track gain, in order to create typical demo fade in and out. You can tweak the fade intervals and duration.
The Fattener delays one side of the stereo spectrum to create a typical fattening effect. You can tune the side and amount that is delayed.
Both plugins are available for free download. Demo Maker and The Fattener are for Windows only.
More info: Demo Maker and The Fattener