Here's a BSP tool - the originals for Doom were both in Objective-C and big-endian, so third party tools were used when the community made level editing tools

Here's a BSP tool - the originals for Doom were both in Objective-C and big-endian, so third party tools were used when the community made level editing tools http://games.moria.org.uk/games/doom/bsp/ http://games.moria.org.uk/games/doom/bsp/