Hermann,
I use the Mere Mortals Framework and have been very pleased. There is a quick start quide that will let you build a simple app without too much knowledge of what is going on underneath, but like anything else, there is a learning curve when you want to do serious development. On the bright side, their manual is very good and the code is heavily documented.
For more information, look in the third party section here on UT under Codebook for Mere Mortals or check out their web site
www.oakleafsd.com.
Kind Regards,
Mat Kennedy
Decision Support Technology Inc.