Note there are several BSP formats, all named BSP, but Blitz3D does suport only the "Quake 3 Arena" BSP format!
I suggest you look around in the Q3A community for modded levels and user made BSP levels.
ID soft has declared the sourcecode of Q3 to be open source lately. I am not 100% sure if this means you could freely use the product of their Compiler (product= the BSP file) in your commercial games, but I guess there's a good chance. You may have to ask them, and when they see it's a small indy game, they probably will say yes.
I suggest you look around in the Q3A community for modded levels and user made BSP levels.
ID soft has declared the sourcecode of Q3 to be open source lately. I am not 100% sure if this means you could freely use the product of their Compiler (product= the BSP file) in your commercial games, but I guess there's a good chance. You may have to ask them, and when they see it's a small indy game, they probably will say yes.