Line-based

Hmmm... There's a few things you may think of when you think of "line-based," right? Well, in the DOOM-Editing world, line-based is exactly what it sounds like; in a line-based editor, you construct the world around the player by drawing lines that snap to a grid (or not, your choice) and then you manually edit things like SIDEDEFs and SECTOR-references from there, the exception being DOOM Builder.

The one bad thing about line-based editors is that they're so damn simple any newbie can pop it open, make a horrid level with two-sided lines that lead into the void polluting the entire WAD and therefore surprising even the designer himself that the map even runs at all, and spit it back into the community.

But there's also the good part to line-based editors in there, as well; you can learn from your mistakes easily, and you can become more experienced much easier, since fiddling with "Split Linedef" and all those wretched WADAuthor commands are not needed, since you can just draw Sector XYZ in the shape you want from the start.

To close this shitty little article off, some good line-based tools you may want to check out are:

DOOM Builder

HellMaker (Mac)

SLADE (not necessarily line-based, though)

WadC <--- Good luck :/

WADED <--- Someone please tell me what the hell happened to my article on this one