thanks for your answer!
I know there are lots of projects out there, that's why I 'm asking for recommendation (to save some time).
I am looking for something that is
1. Stable on all android versions since Android 2.2
2. Cross-platform if possible, but stability is way more important
3. Preferably opensource (but I am willing to pay if I get stability and cross-platform).
Somehow I doubt that cross-platform engine would work good on all platforms but I would be happy if somebody proved me that I was wrong.