Game programming for kids: looking for open source 2D game development kit

[Max Kubierschky]

Hello,

I'm planning to give a game programming course for kids of mixed age.
For this, I am looking for an open source 2D game development kit.
I am also willing to participate in the development of the development kit.

Features I'd like to see
- Possibility to construct simple games via drag and drop without programming
- Integration into an IDE
- Based on Java or Python
Pluses:
- Good Tutorial
- German documentation

Any Ideas?

Max