Doom 3 Automatic Map Builder is a tool that helps you create playable map layouts within a matter of minutes, so you can get right into the nitty gritty of real mapping, detailing, entity placement, etc... and skip the tedious work of manually blocking out maps within bulky Doom3Edit.
With D3AMB you can sketch out multiple floors of your map in a grid like environment. You can automatically place lights, entities such as monsters or models, have D3AMB place columns for you and even doors and visportals are automatically created if you want.
Using D3AMB you can create intricate block outs for your maps as starting point, you don't have to be afraid of ending up with an unstructured workflow as your maplayout will be consistent throughout the map.
You can use D3AMB to experiment with a diverse set of abstract maps as well. It can deliver fully playable maps by featuring entity placement. So you can create a map from scratch that's playable from beginning to end.
This is an Alpha version. This means that NOT ALL features might work, might work as predicted, or might cause error messages. If you do receive an error message then press 'continue', save your work under a different name as quickly as possible and restart D3AMB.
For more information on what D3AMB is and does, this video should be all the explanation you need!: