No demos to download...
...but some videos to watch instead.
Where are the demos?
Creating and maintaining good demos in addition to advancing the engine and creating games is a lot of work.
The current demos feel outdated and don't do the engine's current state justice anymore. So i took them down and suggest that you look at the projects section instead.
Naroth - Game Trailer
jPCT demo reel (desktop Java only)
Tech demo of Naroth, a 3D RPG (Android)
Parallax mapping on Android
An3DBenchXL on Android
jPCT-AE on Android and BlackBerry