don't worry about buying it darkfluff, its going to be free, and its pretty easy to use (although i would say that, i'm building it). I'll try to make some proper help for it before release.
arrow: yeah at the moment i can only think how to make it as DB lights, but i'm thinking hard on how to make a lightmapping system, but its a bit hard.
I'm thinking of adding 2D view to make being precise a bit easier. Prefabs and entities will also be added in (although the entities will need to be coded by you in DB-more on that later)
oh also, it will have its own scripting engine so you can make scripted scenes (like half-life)
Manic
I don't have a sig, live with it.