The AirBlast demo comes with source, and is a complete network playable game developed by the Lead Developer of GLScene. What more could you ask for?

In fact, there are litterly 100's of games done with GLScene, check out the NG's and do a google. Lots of people have spent time putting together good samples and quality products with the package.

http://sourceforge.net/project/showf...ease_id=312848

PS: I know that AirBlast is for Delphi, but the same concepts work in Lazarus. Also try contacting SkinHat about the lazarus port. He wrote all the games on his site in Lazarus+GLScene if I remember correctly. His version also includes the BSP and Quark implementations.