This was already posted and lead to an endless argument about reinventing the wheel and stuff so i think devellopers are aware about this engine

PS devs don\'t develop their own engine. They use Crystal Space (
http://crystal.sf.net. They don\'t plan to change engine for obvious reasons. Although, NeL does a lot more than just graphisms but using NeL features is still out of question. This will cost too much time to make the things work together.
Inspiration is another thing though that i can\'t really comment. This is one of the best thing in the Open Source but i don\'t know what are the relations of Crystal Space and Planeshift devs towards this engine.
I hope i didn\'t say mistakes - i\'m not a Planeshift develloper.