Here is a request for a little edutainment game.
It is described on it's homepage as "logic-puzzle game" and started as KAtomic clone. It is Open source and uses the GPL license. It looks pretty portable and runs from portable devices. All it probably needs is a pretty PAM wrapper and some checking wether it uses the registry.
In a space restricted by blocks you have to assemble molecules by moving the detached atoms around. It's quite fun and educational without lecturing so almost a must have for responsable "grownups" who whant to coax kids into chemistry
The homepage with download link is at: