Ya3dag is based on the quake 2 modification Quake2maX and the lazarus game dll. Want to create your own levels? Well, you've come to the right place. Ya3dag has a built-in "what you see is what you get" level-editor and has been specifically designed for rapid level creation. Terrain, smart NPC's, weather, physic simulation, ...
Voxel for Ya3dag.
Some pictures from my current work.
An image of the built-in editor.