First: thanks for answering.
Second: explanations. I asked that because some time ago I was thinking about making my own engine (that would be called LIXOO), but surfing over there I found some interesting projects that were on development at that moment, so I decided to wait until they were finished. Surprisingly the webpage for SCRAMM (the most interesting, I think) dissapeared. So I needed to know
Third: now I'm wondering (again) wether I'll start my engine or not. If I decide to do it, I'll post to the forum (and probably I'll be bothering you with technical questions from time to time
Maybe LIXOO could start its life now it's going to be summer...