Maybe someone is interested in testing and editing small apps that are executed via an interpreter on the arduino UNO itself. A short description of my project (that is based on a TFT-touch-shield with a sd-card) can be found here:http://playground.arduino.cc//Main/4aos
Well its all quite basic and a lot of compromises had to be made (32 kB of compiled code and 2 kB RAM isn't really much), but in the end its nearly a stand-alone OS (obviously no interrupt-control, no multitasking...).
Any ideas to improve this project are welcome. Here's a short demonstration:http://youtu.be/wgT-P-NlnEw
The source code is too long for this post, you will found the link to 'gzipped' folder in the 'playground'-article.